Criminal Appeals, Wrongful Convictions, and the Correction of Miscarriages of Justice in Canada

Criminal Appeals, Wrongful Convictions, and the Correction of Miscarriages of Justice in Canada

Introduction

A criminal conviction is one of the most consequential decisions that a legal system can make. It may result in imprisonment, restrictions on liberty, reputational damage, financial hardship, family separation, and long-term exclusion from professional and social life. Because the consequences are so serious, criminal justice cannot end its inquiry merely when a trial court pronounces a verdict or imposes a sentence. It must also provide mechanisms through which legal errors can be identified, convictions can be challenged, and miscarriages of justice can be corrected.

Canadian criminal procedure recognises this responsibility through a system of appeals, post-conviction remedies, and exceptional review mechanisms. These procedures serve related but distinct purposes. An appeal allows a higher court to examine whether a conviction or sentence is affected by an error of law, an unreasonable factual conclusion, or a miscarriage of justice. A further appeal may permit the Supreme Court of Canada to resolve questions of national legal importance. In exceptional circumstances, a person who has exhausted ordinary appeals may seek a ministerial review of a possible miscarriage of justice. Where new evidence or serious doubts about the reliability of a conviction emerge, the law must provide a route by which those concerns can receive meaningful consideration.

The Canadian framework is not based on the assumption that every conviction is necessarily correct once the trial process has concluded. Nor does it treat an appeal as an unrestricted opportunity to conduct the trial again. Rather, it seeks to reconcile two fundamental requirements: the finality of criminal proceedings and the continuing obligation to ensure that criminal liability is established lawfully and reliably. Finality protects the administration of justice, the interests of victims and witnesses, and public confidence in the courts. Corrective review protects the accused, the integrity of the legal process, and the legitimacy of the criminal justice system itself.

This article examines the principal mechanisms through which criminal convictions and sentences may be challenged in Canada. It considers appeals as of right and appeals requiring leave, the respective roles of provincial and territorial courts of appeal and the Supreme Court of Canada, the legal grounds for appellate intervention, and the remedies available when an appeal succeeds. It also examines wrongful convictions, fresh evidence, DNA and other scientific developments, the role of the Crown, and the statutory process for investigating alleged miscarriages of justice after ordinary appeal rights have been exhausted.

The subject is closely connected with the constitutional guarantees of the accused, particularly the presumption of innocence, the right to a fair hearing, and the right of appeal where provided by law. It also illustrates an essential feature of the Canadian criminal justice system: a conviction must remain open to correction when a material error undermines its legal or factual foundation.

1. The legal foundations of criminal appeals

Unlike some civil proceedings, criminal appeals in Canada are not an unrestricted continuation of the original case. The right to appeal, the persons entitled to appeal, the grounds that may be raised, the applicable deadlines, and the powers of the appellate court are governed principally by statute. The Criminal Code establishes the central framework, particularly Part XXI, which deals with appeals by persons convicted of indictable offences and appeals by the Crown, and Part XXVI, which contains provisions concerning summary conviction appeals. Constitutional guarantees and the common law principles governing appellate review operate alongside these statutory rules.

The starting point is that a criminal appeal is a legal process for reviewing a decision made by a lower court. It is not ordinarily a second trial. The appellate court examines the trial record, the grounds of appeal, the reasons given by the trial judge, and the applicable law. It asks whether the decision can stand in light of the alleged error and the statutory standards for intervention.

This distinction is important. A person who has been convicted may believe that the trial judge misunderstood a witness, gave insufficient weight to a defence argument, or reached a conclusion with which the accused strongly disagrees. Those concerns do not automatically establish a legal basis for appeal. Appellate courts generally respect the trial judge’s responsibility to assess evidence and make factual findings, particularly where credibility is involved. Intervention requires a recognised ground of appeal and an error or irregularity of the kind that the law permits the appellate court to correct.

The statutory framework also reflects the principle that the prosecution and the accused do not necessarily have identical rights of appeal. A convicted person may challenge a conviction on grounds defined by the Criminal Code, while the Crown’s ability to appeal an acquittal is more restricted, particularly because an acquitted person benefits from the presumption of innocence and the protection against repeated prosecution.

The appellate system must therefore balance the accused’s right to challenge an unlawful conviction, the public interest in correcting serious legal errors, the rights of victims and witnesses, and the need for criminal proceedings to reach a point of finality.

2. The first level of appeal: provincial and territorial courts of appeal

The ordinary route for challenging a conviction following an indictable prosecution is an appeal to the court of appeal of the province or territory in which the conviction was entered. These courts form the principal appellate level in the Canadian judicial structure. Although their names and institutional arrangements differ across jurisdictions, their criminal appellate functions are governed substantially by the Criminal Code.

The relevant statutory provision is section 675. It gives a person convicted of an indictable offence the right to appeal against the conviction on a question of law alone. An appeal involving a question of fact, or a question of mixed law and fact, generally requires leave of the court of appeal or a judge of that court, unless the trial judge certifies that the case is a proper one for appeal. The Code also permits leave to appeal on another ground that the court of appeal considers sufficient.

This distinction between questions of law, questions of fact, and questions of mixed law and fact is central to Canadian appellate procedure.

A question of law concerns the legal rules applied by the trial court or the interpretation of a statutory or constitutional provision. Examples include whether the trial judge applied the correct legal test for self-defence, whether the jury received an erroneous instruction on the burden of proof, or whether evidence was excluded under an incorrect interpretation of the law of privilege.

A question of fact concerns findings about what happened. It may involve the identity of the perpetrator, the sequence of events, the reliability of a witness, or the existence of a particular circumstance. Because the trial judge or jury heard the evidence directly, appellate courts are generally reluctant to substitute their own factual conclusions for those reached at trial.

Questions of mixed law and fact arise where a legal standard must be applied to the facts established in the case. For example, determining whether police conduct amounted to an unreasonable search may involve both the interpretation of the constitutional standard and the application of that standard to the particular circumstances.

The distinction is not always easy to draw. A ground of appeal may contain both legal and factual elements. The classification of the alleged error can determine whether leave is required and what standard of review applies.

Section 675 also provides for appeals against sentence. A convicted person may generally appeal a sentence with leave of the court of appeal or a judge of that court, unless the sentence is fixed by law. The sentence appeal is distinct from an appeal against conviction. A person may accept that the conviction was legally valid while arguing that the punishment was excessive, disproportionate, based on an error of principle, or otherwise unlawful.

The court of appeal may also review certain orders affecting parole eligibility, dangerous-offender or long-term-offender proceedings, and other matters where the Criminal Code expressly provides an appeal route. These specific statutory provisions demonstrate that criminal appellate jurisdiction is not confined to the question of guilt. It also supervises important decisions affecting the legal consequences of conviction.

The right of appeal is therefore structured rather than unlimited. The statutory distinctions are designed to ensure that serious legal errors can be corrected while preventing every disagreement about the trial judge’s assessment of the evidence from becoming a full appellate reconsideration.

3. Appeals in summary conviction proceedings

Not every criminal prosecution follows the indictable procedure. Many offences are prosecuted summarily, and the appeal structure for summary conviction proceedings is different.

Part XXVII of the Criminal Code governs summary conviction appeals. Depending on the nature of the decision and the jurisdiction, an appeal may be brought to a provincial superior court or another court designated by the applicable statutory framework. The precise route depends on the type of decision being challenged and the relevant provisions of the Code.

A summary conviction appeal may concern a conviction, an acquittal, a sentence, or a question of law. The available grounds and the possibility of a further appeal are subject to statutory restrictions. In some circumstances, a further appeal may be available to the court of appeal on a question of law, often with leave.

This structure reflects the different procedural treatment of summary offences. The legislature has sought to provide meaningful review while recognising that summary proceedings are intended to be more streamlined than indictable trials.

The distinction is particularly important where a person assumes that every criminal conviction can be appealed directly to the provincial or territorial court of appeal. That is not necessarily correct. The procedural classification of the offence, the court that entered the decision, and the applicable statutory appeal provisions determine the appropriate route.

A procedural mistake can have serious consequences. A notice filed in the wrong court, an application that raises a ground not available under the relevant provision, or a missed statutory deadline may complicate or prevent an appeal. The applicable rules of the particular court must therefore be examined together with the Criminal Code.

4. Appeals to the Supreme Court of Canada

The Supreme Court of Canada is the country’s final court of appeal. It does not ordinarily function as a further general review court for every criminal case. Its role is selective and is directed primarily toward questions of law of public importance, including issues that require clarification or consistent interpretation across Canada.

The Criminal Code provides specific routes for criminal appeals to the Supreme Court. Section 691 governs appeals by persons convicted of indictable offences in defined circumstances. A person whose conviction has been affirmed by a court of appeal may appeal to the Supreme Court as of right on a question of law on which a judge of the court of appeal dissented. In other cases, an appeal may proceed if the Supreme Court grants leave.

Section 691 also addresses certain appeals where an acquittal has been set aside. The precise route depends on whether the court of appeal entered a conviction, whether there was a dissent on a question of law, and whether leave is granted.

Other provisions regulate appeals concerning acquittals, sentences, and appeals by the Attorney General. Sections 692 and 693 form part of this statutory structure. The Crown does not possess an unrestricted right to appeal a decision merely because it disagrees with the result.

The Supreme Court’s leave jurisdiction is important. It enables the Court to select cases that raise significant legal questions, rather than hearing every dispute that has passed through a provincial or territorial court of appeal. The Court may consider whether the proposed appeal raises an issue of national importance, whether there is a conflict among appellate courts, whether the legal question requires clarification, or whether the case presents an issue of public significance.

An application for leave is not the same as an appeal hearing. If leave is refused, the Supreme Court does not thereby endorse every aspect of the lower court’s reasoning. It means that the Court has declined to exercise its discretionary jurisdiction to hear the case.

Where leave is granted, the Supreme Court considers the appeal and may affirm or reverse the decision under review, depending on the legal issues and the remedies available. Its judgments establish authoritative interpretations of federal criminal law and constitutional principles. These decisions bind lower courts throughout Canada.

The Supreme Court’s appellate function is particularly important where a criminal appeal raises questions about the scope of Charter rights, the interpretation of criminal offences, the admissibility of evidence, the constitutional validity of legislation, or the standards governing a fair trial.

Official information about the Court’s appellate work and its leave process is available through the Supreme Court of Canada judgments and decisions service. The statutory appeal provisions are found in the Criminal Code.

5. Grounds for allowing a criminal appeal

Section 686(1)(a) of the Criminal Code identifies three principal grounds on which a court of appeal may allow an appeal against conviction:

1. The verdict is unreasonable or cannot be supported by the evidence.
2. The judgment should be set aside because of an error of law.
3. There has been a miscarriage of justice.

These grounds overlap in some circumstances, but they address different forms of failure in the trial process. They also demonstrate that an appellate court is concerned not only with whether the trial was conducted according to procedural rules, but also with whether the resulting conviction can lawfully and reliably stand.

5.1 An unreasonable verdict or a verdict unsupported by the evidence

A verdict may be unreasonable where it cannot be reconciled with the evidence considered as a whole. This ground is particularly important in cases involving circumstantial evidence, conflicting testimony, or a jury’s assessment of the prosecution’s case.

The appellate court does not simply ask whether there was some evidence capable of supporting the conviction. It must examine the evidence in a meaningful way and determine whether the verdict is one that a properly instructed trier of fact, acting judicially, could reasonably have reached.

The Supreme Court of Canada explained this approach in R. v. Yebes, [1987] 2 S.C.R. 168, and developed it further in R. v. Biniaris, 2000 SCC 15. In R. v. W.H., 2013 SCC 22, the Court emphasised that the appellate court must review, analyse, and weigh the evidence, while respecting the institutional role of the trial judge or jury.

This is not an invitation to conduct a new trial on appeal. The appellate court does not replace the jury’s assessment simply because it might have reached a different conclusion. The question is whether the verdict falls outside the range of conclusions reasonably available on the evidence.

The ground is particularly significant where a conviction depends on circumstantial evidence. The prosecution must establish guilt beyond a reasonable doubt. If the evidence, considered as a whole, leaves reasonable alternative inferences inconsistent with guilt, the conviction may be vulnerable. However, the existence of a theoretical alternative explanation does not automatically make a verdict unreasonable. The court must assess the evidence in its entirety and apply the correct standard of proof.

An unreasonable-verdict appeal therefore protects against convictions that lack a sufficient evidentiary foundation, without converting the appellate court into a second jury.

5.2 Errors of law

An error of law occurs where the trial court applies an incorrect legal rule, misunderstands the governing statutory provision, misdirects the jury on an essential element of the offence, or otherwise conducts the proceedings according to an erroneous legal standard.

Examples include:

• applying the wrong test for criminal responsibility;
• misstating the elements of an offence;
• giving an incorrect instruction about the burden or standard of proof;
• improperly admitting or excluding evidence because of a legal error;
• misunderstanding the requirements of a defence;
• failing to apply a relevant constitutional protection;
• imposing a sentence contrary to the Criminal Code; or
• misinterpreting the legal limits of police or prosecutorial authority.

A legal error does not necessarily require the conviction to be quashed. The appellate court must examine the nature of the error, its significance, and its effect on the fairness and reliability of the proceedings.

Section 686(1)(b)(iii) contains an important qualification. Even where the appellate court concludes that an error of law occurred, it may dismiss the appeal if it is satisfied that no substantial wrong or miscarriage of justice occurred. This is commonly described as the curative proviso.

The proviso does not mean that legal errors are unimportant. It reflects the principle that an appellate court should distinguish between an error that affected the legal integrity or outcome of the trial and one that was harmless in the circumstances. Its application must be consistent with the seriousness of the error and the constitutional requirement of a fair trial.

Where the error could reasonably have affected the verdict, or where the appellate court cannot conclude that the proceedings remained fair and reliable, the proviso will not justify maintaining the conviction.

5.3 Miscarriage of justice

The third ground is broader. A miscarriage of justice may arise where the proceedings, considered as a whole, were fundamentally unfair or where an error undermined the integrity of the trial in a way that makes it unjust to allow the conviction to stand.

The concept is not limited to proof that the accused was factually innocent. A person may have committed the offence and nevertheless have been convicted through a process that violated fundamental legal requirements. Conversely, a person may be factually innocent even though the trial appeared procedurally regular on the record available at the time.

A miscarriage of justice can arise from a combination of errors rather than one isolated mistake. For example, inadequate disclosure, unreliable expert evidence, improper Crown conduct, a defective jury instruction, and ineffective representation may interact in a way that compromises the fairness of the proceedings.

The courts must therefore examine the practical effect of the alleged irregularities, rather than treating each one as an entirely separate technical issue.

A miscarriage of justice may also be established where the accused was denied a meaningful opportunity to present a defence, where the trial was affected by serious procedural unfairness, or where the integrity of the adjudicative process was compromised.

The statutory power to intervene on this ground is an essential safeguard. It recognises that a criminal trial is not fair merely because it formally followed the required procedural steps. The process must also be substantively just.

6. Standards of appellate review

The standards applied by appellate courts are central to the division of responsibility between trial courts and appellate courts. Different types of alleged error attract different standards of review.

Questions of law are generally reviewed for correctness. The appellate court determines whether the trial judge applied the correct legal rule. It does not defer to an incorrect interpretation of the law merely because the trial judge was experienced or carefully considered the issue.

Findings of fact, by contrast, are generally reviewed under a deferential standard. Appellate courts do not ordinarily interfere with factual findings unless the appellant demonstrates a palpable and overriding error or another recognised basis for intervention under the applicable appellate framework.

A palpable error is one that is plainly identifiable. An overriding error is one that affects the result or the material findings. The precise formulation depends on the nature of the decision and the governing authorities.

Questions of mixed law and fact require the appellate court to identify whether the alleged error concerns the legal principle itself or its application to the facts. Where an extricable error of law is identified, correctness applies to that legal issue. Otherwise, the applicable standard will ordinarily reflect the factual or mixed character of the finding.

The distinction is particularly important in appeals involving credibility. A trial judge has the advantage of seeing and hearing witnesses, observing their testimony, and assessing the evidence in the context of the entire proceeding. An appellate court usually works from the written or recorded transcript. It must therefore exercise caution before substituting its own assessment of credibility.

However, deference is not absolute. A credibility finding may be challenged where it is based on a material misapprehension of evidence, ignores relevant considerations, rests on an erroneous legal assumption, or cannot reasonably be reconciled with the record.

The purpose of these standards is not to make convictions difficult to challenge. Rather, they recognise that different courts have different institutional roles. Trial courts determine facts in the first instance; appellate courts ensure that the law was correctly applied and that the resulting decision can stand.

7. Procedural requirements, deadlines, and preparation of an appeal

A criminal appeal is subject to procedural requirements that can be decisive. The appellant must identify the decision being challenged, the statutory basis for the appeal, the grounds relied upon, and the relief sought. The appeal must also be commenced within the applicable time limit or accompanied by an application for an extension where the law permits one.

For indictable proceedings, section 678 of the Criminal Code governs the time for instituting an appeal and permits an application for an extension in appropriate circumstances. The precise procedural requirements must be read together with the rules of the relevant provincial or territorial court of appeal. Summary conviction appeals are governed by the distinct provisions of Part XXVII and applicable court rules.

An appeal generally depends on the trial record. That record may include the transcript of proceedings, exhibits, written rulings, jury instructions, sentencing materials, and the trial judge’s reasons. The appeal court must be able to identify the alleged error and understand how it arose in the original proceedings.

The preparation of a criminal appeal therefore involves more than stating that the verdict was unfair. Counsel must examine the record, identify the legal issue, explain the applicable standard of review, and demonstrate why the alleged error justifies appellate intervention.

In some cases, the appellant may need to obtain leave to appeal or seek an extension of time. The court may also require an application to introduce fresh evidence. These matters are procedurally distinct and may involve separate written materials and hearings.

The fact that an appeal has been filed does not automatically mean that the appellant will be released from custody. A convicted person may seek bail pending appeal under the applicable statutory provisions, but release is governed by separate legal criteria. The appeal itself and the application for release must therefore be treated as distinct proceedings.

8. The admission of fresh evidence on appeal

One of the most important safeguards in criminal appellate law is the possibility of introducing evidence that was not before the trial court.

A criminal appeal is normally decided on the evidence presented at trial. This preserves the integrity of the trial process and prevents appellate proceedings from becoming an unrestricted opportunity to reconstruct the case. However, rigidly limiting appellate review to the original record could produce injustice where significant evidence emerges only after conviction.

Canadian law therefore recognises the admission of fresh evidence in appropriate circumstances.

The leading framework is the four-part test established by the Supreme Court of Canada in Palmer v. The Queen, [1980] 1 S.C.R. 759. The court considers:

1. Due diligence: Could the evidence, with reasonable diligence, have been obtained and presented at trial?
2. Relevance: Does the evidence relate to a decisive or potentially decisive issue?
3. Credibility: Is the evidence reasonably capable of belief?
4. Potential effect: If accepted, could the evidence reasonably be expected to have affected the result when considered with the evidence presented at trial?

The due diligence requirement is not applied as rigidly in criminal proceedings as it may be in civil cases. The interests of justice may justify admitting evidence even where it could theoretically have been discovered earlier. The central concern is whether the new material is sufficiently important and reliable to warrant appellate consideration.

Fresh evidence may take many forms. It may consist of a witness who was previously unknown, a recantation by a prosecution witness, a newly discovered document, a forensic reassessment, or scientific evidence that was unavailable or not properly understood at the time of trial.

The distinction between fresh evidence and new evidence is sometimes useful. Fresh evidence generally concerns facts or events that existed before the decision under appeal but were not presented to the original court. New evidence may concern events that occurred after the decision. The legal treatment depends on the nature of the material and the purpose for which it is offered.

The admission of fresh evidence does not automatically establish innocence. It means that the appellate court considers the evidence sufficiently relevant and reliable to be examined as part of the appeal. The court must then determine what effect it has on the conviction and whether the statutory grounds for intervention are satisfied.

In R. v. Sipos, 2014 SCC 47, the Supreme Court discussed the application of the Palmer framework and the relationship between fresh evidence, appellate jurisdiction, and the finality of proceedings. The decision illustrates the need to balance the interests of justice against the institutional limits of appellate review.

Fresh evidence is particularly important in cases where scientific developments, disclosure failures, or newly available witnesses raise serious doubts about the original verdict.

9. DNA evidence and scientific developments

Scientific developments have become particularly important in the correction of wrongful convictions. DNA analysis can sometimes establish that biological material recovered from a crime scene does not belong to the person convicted. In other cases, it may identify another individual or reveal that an earlier forensic conclusion was scientifically unsound.

The importance of DNA evidence is not limited to its capacity to exclude a person as the source of biological material. It can also expose weaknesses in the investigative theory that led to the conviction. Where the prosecution case depended heavily on a particular interpretation of physical evidence, a reliable scientific reassessment may fundamentally alter the understanding of the case.

However, DNA evidence must be interpreted carefully. A DNA result does not necessarily establish who committed an offence, when biological material was deposited, or the circumstances in which it came to be present. Its significance depends on the nature of the sample, the collection and preservation procedures, the analytical method, the statistical interpretation, and the relationship between the result and the other evidence.

The absence of DNA evidence is also not proof of innocence. Many offences do not involve recoverable biological material, and the passage of time may make testing impossible. A review system must therefore be capable of examining other forms of fresh evidence, including witness evidence, documentary material, digital records, forensic pathology, and previously undisclosed information.

Scientific reassessment may be important even where the original testing was conducted competently according to the standards of the time. Forensic methods evolve. An analysis once regarded as reliable may later be shown to have limitations that were not adequately understood. Hair-comparison evidence, bite-mark analysis, certain forms of pattern comparison, and disputed forensic pathology have all raised questions about the reliability and presentation of expert evidence in criminal proceedings.

The central legal issue is not whether a scientific technique has a technical or scientific name, but whether the evidence is sufficiently reliable, properly interpreted, and fairly presented to support the conclusion for which it is offered.

The Canadian experience demonstrates why courts and investigators must distinguish between scientific evidence and the interpretation placed upon it. A forensic conclusion can appear persuasive while depending on assumptions that are uncertain, incomplete, or unsupported by the underlying data.

10. Wrongful convictions: meaning and distinction from other miscarriages of justice

A wrongful conviction occurs when a person is convicted of an offence that the person did not commit. It is among the most serious failures that can occur within a criminal justice system because it imposes the state’s punitive authority on an innocent individual.

The concept of a miscarriage of justice is broader. It may include a wrongful conviction, but it also covers serious failures in the process through which criminal liability is determined. A conviction may be set aside because of a constitutional violation, an unfair trial, an erroneous legal ruling, or another serious procedural defect even where the appellate court does not determine that the accused was factually innocent.

This distinction matters in law and public policy. An acquittal means that the prosecution has not established guilt beyond a reasonable doubt. It does not necessarily amount to a judicial declaration that the accused did not commit the offence. Equally, the quashing of a conviction does not always establish factual innocence. A conviction may be overturned because the trial was legally defective, because the evidence was insufficient, or because a new trial is required.

The Canadian legal system generally does not treat an appellate court as an institution whose ordinary function is to issue a formal declaration of factual innocence. Its role is to determine whether the conviction can lawfully stand and what remedy is required.

Nevertheless, the distinction should not diminish the seriousness of a wrongful conviction. A person who has spent years imprisoned for an offence that they did not commit has suffered a profound injustice, even if the legal proceedings that eventually correct the conviction do not produce a formal declaration of innocence.

Wrongful convictions also have consequences beyond the person convicted. They may leave the actual perpetrator unidentified, expose the public to continuing risk, undermine confidence in police and prosecutors, and cause lasting harm to victims and their families. Correcting a wrongful conviction is therefore not merely an individual remedy. It is an important public responsibility.

11. Principal causes and contributing factors

Wrongful convictions rarely result from a single isolated mistake. They may arise through a combination of investigative, evidentiary, prosecutorial, defence, and judicial failures. The Public Prosecution Service of Canada identifies several recurring contributing factors in its guidance on preventing wrongful convictions. These include tunnel vision, incomplete disclosure, eyewitness misidentification, false confessions, false accusations, perjury, unreliable jailhouse informants, and faulty forensic evidence. PPSC+1

11.1 Tunnel vision

Tunnel vision occurs when investigators or prosecutors become excessively committed to one theory of the case and begin to interpret new information through that theory.

Once a suspect has been identified, evidence consistent with guilt may receive disproportionate attention, while contradictory evidence is discounted or overlooked. Alternative suspects may not be investigated with sufficient seriousness. Witnesses may be questioned in ways that reinforce the existing theory, and ambiguous facts may be interpreted as confirmation.

Tunnel vision is particularly dangerous because it can influence several stages of the criminal process. It may shape the investigation, affect the selection of charges, influence disclosure decisions, and determine how evidence is presented at trial.

The wrongful conviction of Guy Paul Morin is a prominent Canadian example. Morin was convicted of the murder of nine-year-old Christine Jessop. He was later acquitted after DNA evidence excluded him as the source of the relevant biological material. The public inquiry that followed examined the investigative and forensic failures that had contributed to the conviction.

The Morin case demonstrated that a mistaken investigative theory can become increasingly resistant to correction when institutional participants interpret later developments in a manner that preserves their original conclusions.

11.2 Eyewitness misidentification

Eyewitness testimony can be compelling, but human memory is not a recording device. Perception may be affected by lighting, distance, stress, duration of observation, the presence of weapons, and the passage of time.

Memory may also be influenced by subsequent events. Suggestive identification procedures, exposure to photographs, conversations with other witnesses, media reporting, and repeated questioning may alter a witness’s recollection or confidence.

A witness may sincerely believe that an identification is accurate while being mistaken. The risk is not limited to deliberate falsehood. A mistaken identification may become more persuasive when the witness expresses confidence, even though confidence is not necessarily a reliable measure of accuracy.

Police identification procedures must therefore be designed to minimise suggestion and contamination. At trial, the defence must have a meaningful opportunity to challenge the conditions under which the identification was made and the reliability of the witness’s recollection.

11.3 False confessions and unreliable statements

A confession may appear to be powerful evidence of guilt, but not every confession is true. False confessions may result from coercion, threats, exhaustion, psychological vulnerability, misunderstanding, suggestive interrogation, or a desire to escape an oppressive situation.

Young people, persons with intellectual or cognitive disabilities, and individuals experiencing acute psychological distress may be particularly vulnerable to certain interrogation pressures.

A statement may also become contaminated where investigators disclose details of the offence to the suspect and later treat the suspect’s repetition of those details as proof that the person possessed independent knowledge.

The assessment of a confession must therefore consider the circumstances in which it was obtained, whether it was voluntary, whether the account contains independently verifiable details, and whether it is consistent with reliable evidence.

11.4 Jailhouse informants

A jailhouse informant is a person who claims that another accused or convicted person made an incriminating statement while in custody.

Such testimony may be unreliable where the informant expects a benefit, hopes to obtain favourable treatment, seeks attention, or wishes to improve their own legal position. The risk is especially serious where the alleged confession cannot be independently verified.

The danger is not that every jailhouse informant is necessarily dishonest. It is that the circumstances may create powerful incentives to fabricate or exaggerate evidence. The defence must be informed of relevant benefits, promises, prior inconsistent accounts, and credibility concerns so that the testimony can be properly tested.

Canadian inquiries into wrongful convictions have repeatedly emphasised the need for caution in the use of this evidence.

11.5 Incomplete disclosure

The Crown’s disclosure obligation is a fundamental protection against wrongful conviction. The prosecution must disclose relevant information in its possession or control, subject to recognised legal limits such as privilege and irrelevance.

A failure to disclose information may prevent the defence from challenging a witness, identifying an alternative suspect, testing the reliability of forensic evidence, or presenting an effective defence.

Disclosure failures are especially damaging where the withheld information concerns a witness’s credibility, an inducement offered to an informant, inconsistent statements, police misconduct, or evidence pointing away from the accused.

The Supreme Court’s decision in R. v. Stinchcombe, [1991] 3 S.C.R. 326, established the modern constitutional framework for Crown disclosure. Later decisions, including R. v. McNeil, 2009 SCC 3, developed the principles governing relevant information held by the police and other state actors.

11.6 Unreliable forensic evidence

Forensic evidence may contribute to a wrongful conviction where the underlying method is unreliable, the expert overstates the significance of the findings, the limitations are not explained, or the evidence is presented in a misleading way.

An expert may be highly qualified in a particular discipline while lacking a sound basis for a specific conclusion. Courts must therefore assess not only the qualifications of the witness but also the reliability and relevance of the methodology.

A further danger arises where the expert evidence is treated as independent confirmation even though the analysis was influenced by information about the suspect or the prosecution theory.

11.7 Ineffective defence representation

Defence counsel has a central role in testing the prosecution’s case. Serious failures in representation may contribute to wrongful conviction where counsel does not investigate an obvious defence, fails to challenge important evidence, neglects to obtain necessary expert assistance, or provides materially incorrect legal advice.

Not every unsuccessful defence establishes ineffective assistance. A trial may be lost despite competent representation. Appellate intervention requires a legally sufficient basis, and the assessment generally considers whether counsel’s performance fell below the required standard and whether the deficiency resulted in a miscarriage of justice.

11.8 False guilty pleas

A guilty plea is ordinarily an admission of responsibility and may lead to conviction without a full trial. However, an innocent person may sometimes plead guilty because of pressure, fear of a more severe sentence after trial, inadequate legal advice, immigration or family consequences, or a mistaken belief that the evidence makes acquittal impossible.

The possibility of a false guilty plea is particularly important in cases involving vulnerable accused persons or individuals who do not fully understand the legal consequences of their decision.

The criminal justice system must therefore ensure that guilty pleas are voluntary, informed, and unequivocal. A plea should not be treated as immune from later review where credible new information suggests that it was connected with a miscarriage of justice.

12. Canadian wrongful-conviction cases and public inquiries

Canadian public inquiries have played an important role in identifying the institutional conditions that can produce wrongful convictions. They have also contributed to reforms in police practices, disclosure, forensic evidence, prosecutorial ethics, and conviction review.

Several cases are particularly significant.

12.1 Donald Marshall Jr.

Donald Marshall Jr., a Mi’kmaq man from Nova Scotia, was wrongfully convicted of murder and spent approximately eleven years in prison before his conviction was overturned.

The Royal Commission on the Donald Marshall, Jr., Prosecution examined the investigation and prosecution and identified serious institutional failures, including the influence of racial prejudice, inadequate police investigation, and prosecutorial shortcomings.

The case demonstrated that wrongful convictions cannot be understood solely as individual errors. They may reflect broader institutional attitudes and structural inequalities that affect how suspects are investigated, how evidence is assessed, and how credibility is attributed.

12.2 David Milgaard

David Milgaard was convicted of the murder of Gail Miller in Saskatchewan and spent decades in prison before DNA evidence helped establish that he had not committed the offence. His conviction was ultimately quashed, and he received a free pardon in 1997.

The Milgaard case became a central reference point in discussions about wrongful convictions, the reliability of witness evidence, investigative conduct, and the need for an effective post-conviction review mechanism.

The legislation establishing the Miscarriage of Justice Review Commission bears the names of David and Joyce Milgaard in recognition of their long campaign for reform.

12.3 Guy Paul Morin

Guy Paul Morin’s conviction for the murder of Christine Jessop was overturned after DNA testing excluded him as the source of the relevant biological evidence. The subsequent Kaufman Commission examined the investigation, the use of forensic evidence, and the institutional tendency to maintain an unsupported theory of guilt.

The case remains an important illustration of tunnel vision and the danger of presenting uncertain forensic conclusions as stronger than the underlying science justifies.

12.4 Thomas Sophonow

Thomas Sophonow was convicted of the murder of Barbara Stoppel in Manitoba. His conviction was overturned, and he was ultimately acquitted after repeated proceedings. The Sophonow Inquiry examined the role of unreliable eyewitness identification, jailhouse informants, and prosecutorial conduct.

The inquiry highlighted the importance of recording investigative procedures, disclosing information relevant to witness credibility, and exercising caution where testimony is given by persons who may benefit from assisting the prosecution.

12.5 James Driskell

James Driskell was convicted of murder in Manitoba. His conviction was later quashed after serious concerns emerged about the forensic evidence and the disclosure of relevant information. The Driskell Inquiry examined the conduct of the prosecution and the handling of evidence.

The case reinforced the principle that the Crown’s obligation is not simply to secure a conviction. Prosecutors must act in the public interest and ensure that the process remains fair, including where information may undermine the prosecution’s case.

These cases are not identical. They involve different combinations of investigative errors, unreliable evidence, institutional failures, and procedural defects. Taken together, however, they demonstrate why a criminal justice system needs both effective trial safeguards and independent post-conviction review.

The Library of Parliament’s research publication, Wrongful Convictions in Canada, provides an accessible account of these cases and the policy reforms they helped inspire. library-biblio.parl.ca

13. The Crown’s continuing responsibility after conviction

The Crown’s role in a criminal prosecution is not properly understood as a duty to obtain or defend a conviction at all costs. Prosecutors are public officials whose overriding responsibility is to the administration of justice.

That responsibility does not end when the trial concludes. Where credible new information emerges that may undermine the reliability of a conviction, the prosecution must consider its legal and ethical obligations in light of the new circumstances.

A prosecutor may need to reassess the evidence, disclose relevant information, investigate whether a witness’s earlier testimony was false, or consider whether the Crown should support an application for a new trial or another appropriate remedy.

This responsibility is especially important where the prosecution discovers that evidence previously presented to the court was materially inaccurate, that important information was not disclosed, or that a forensic conclusion cannot be sustained.

The principle is consistent with the Supreme Court’s recognition of the special role of the Crown in the criminal process. The prosecutor is not a private litigant seeking victory. The prosecutor represents the public interest and must act fairly.

A post-conviction disclosure or review issue may also arise where the relevant information is held by police or another state institution rather than by the prosecution office itself. The division of institutional responsibility cannot be used to defeat the accused’s entitlement to a fair process.

14. Constitutional protections and the correction of wrongful convictions

Several Charter guarantees are particularly relevant to criminal appeals and post-conviction review.

14.1 Section 7: Life, liberty, and security of the person

Section 7 protects life, liberty, and security of the person and provides that these interests may be deprived only in accordance with the principles of fundamental justice.

A criminal conviction and sentence directly affect liberty. The section therefore provides a constitutional foundation for procedural fairness and the protection of individuals against fundamentally unjust criminal proceedings.

Section 7 does not create an unlimited right to appeal every criminal decision. However, it informs the constitutional standards that must govern criminal adjudication and the remedies available where a serious violation has occurred.

14.2 Section 11(d): Presumption of innocence and fair hearing

Section 11(d) guarantees the right of a person charged with an offence to be presumed innocent until proven guilty according to law in a fair and public hearing by an independent and impartial tribunal.

The provision is fundamental to the prevention of wrongful convictions. It places the burden on the prosecution to prove guilt beyond a reasonable doubt and requires the trial process to be fair.

A conviction based on a reversal of the burden of proof, an improper jury instruction, or a materially unfair process may therefore raise constitutional concerns.

14.3 Section 11(h): Protection against double jeopardy

Section 11(h) protects a person who has been finally acquitted from being tried again for the same offence and protects a person who has been finally found guilty and punished from being tried or punished again for it.

The provision must be understood alongside the statutory appeal system. A Crown appeal against an acquittal is permitted in defined circumstances and does not automatically violate section 11(h). The Supreme Court has explained that the constitutional protection operates within a structured system of criminal proceedings and appeals.

The principle is important because correcting a miscarriage of justice must not become a mechanism for repeatedly prosecuting an individual until the state obtains the result it seeks.

14.4 Section 24: Constitutional remedies

Section 24 provides remedies where Charter rights have been infringed or denied. Under subsection 24(1), a court of competent jurisdiction may grant a remedy that is appropriate and just in the circumstances.

In criminal proceedings, remedies may include exclusion of evidence under section 24(2), a stay of proceedings in exceptional circumstances, or other relief necessary to address the constitutional breach.

On appeal, a Charter violation may form part of the legal basis for setting aside a conviction. The appropriate remedy depends on the nature of the violation, its effect on the trial, and the statutory powers of the appellate court.

The Charter does not make every procedural defect a constitutional violation. Nor does every breach automatically result in an acquittal. The court must identify the right infringed and determine the remedy justified by the circumstances.

The Department of Justice’s Charterpedia discussion of section 11(h) provides further explanation of the constitutional protection against double jeopardy. Protection Against Double Jeopardy

15. The ministerial conviction-review process under the existing regime

For a long period, the principal extraordinary mechanism for reviewing a potentially wrongful conviction after the exhaustion of ordinary appeals was the federal Minister of Justice’s power under Part XXI.1 of the Criminal Code.

The historical foundation of this power goes back to 1892. Its purpose is to provide an exceptional safeguard where the ordinary court process has ended but significant concerns remain about the conviction.

Under the existing provisions, a person convicted of an offence under an Act of Parliament or a regulation made under such an Act may apply for ministerial review after exhausting the available rights of judicial review or appeal. The process also applies to certain findings that a person is a dangerous offender or long-term offender.

The review is not an ordinary appeal. It is not designed to provide another opportunity to repeat arguments that have already been considered and rejected by the courts. The applicant must present matters of significance that justify an extraordinary examination of the conviction.

The review may involve new evidence, previously undisclosed information, significant developments in forensic science, evidence of witness unreliability, or other circumstances that raise a substantial concern about the possibility of a miscarriage of justice.

Under the existing statutory regime, the Minister may order a new trial or refer the matter to the appropriate court of appeal where satisfied that there is a reasonable basis to conclude that a miscarriage of justice likely occurred. The Minister may also dismiss the application.

The Criminal Conviction Review Group within the Department of Justice examines applications and conducts the necessary review work. The process may involve obtaining records, seeking information from public authorities, assessing new evidence, and considering whether further investigation is justified.

The review is intended to be independent in its assessment, even though the ultimate decision under the existing regime is made by the Minister. The statutory power is extraordinary and should not be confused with the ordinary appellate jurisdiction of the courts. Ministère de la Justice+2

16. The Miscarriage of Justice Review Commission: Bill C-40 and the new statutory framework

A major reform to Canada’s post-conviction review system was enacted through Bill C-40, the Miscarriage of Justice Review Commission Act (David and Joyce Milgaard’s Law). It received Royal Assent on 17 December 2024.

The legislation amends the Criminal Code to establish an independent Miscarriage of Justice Review Commission. Its purpose is to replace the ministerial review process with a specialised independent body capable of reviewing and investigating applications alleging miscarriages of justice.

The reform responds to longstanding criticism that the Minister of Justice should not be the final decision-maker in a process examining possible failures within the criminal justice system. It also reflects the view that applicants require a review institution with dedicated investigative capacity and a mandate focused specifically on wrongful convictions and miscarriages of justice.

16.1 The Commission’s mandate

The Commission is established as a stand-alone body independent of the Department of Justice. Its mandate is to review applications alleging miscarriages of justice and determine whether a case should be returned to the judicial system.

The legislation provides investigative powers, including powers associated with public inquiries. These may include requiring witnesses to testify under oath and compelling the production of information and evidence.

This is significant because a post-conviction review may require more than an examination of documents submitted by the applicant. It may be necessary to investigate police records, interview witnesses, obtain expert assessments, or examine the conduct of institutions involved in the original proceedings.

16.2 The Commission’s decision-making powers

Under the new statutory framework, the Commission may direct a new trial or hearing, or refer a matter to the court of appeal, where it has reasonable grounds to conclude that a miscarriage of justice may have occurred and considers that returning the matter to the judicial system is in the interests of justice.

The threshold and wording of the new framework are designed to permit a specialised review body to identify cases requiring judicial reconsideration. The Commission does not replace the courts and does not itself conduct a new criminal trial or determine guilt in the manner of a trial court.

Its role is to decide whether the case should be returned to the judicial process through the statutory remedies available to it.

16.3 Access, fairness, and vulnerable applicants

The legislation recognises that applicants may face serious practical barriers. A person who has been imprisoned for many years may have limited access to records, legal assistance, witnesses, and expert evidence. The Commission’s mandate includes consideration of individual circumstances and the distinct challenges faced by certain populations.

The statutory framework specifically requires attention to the circumstances of Indigenous and Black applicants and to the systemic factors that may affect their ability to obtain a remedy.

This reflects a broader recognition that formally equal procedures do not always produce equal access to justice. The ability to identify a wrongful conviction may depend on resources, institutional cooperation, the availability of legal representation, and the willingness of authorities to revisit earlier investigative assumptions.

16.4 The transitional position: the Commission is not yet operational

An important distinction must be made between the enactment of the legislation and the operational commencement of the Commission’s review service.

As reflected in the Department of Justice’s current public information, the Commission has been established in the Criminal Code framework, but the Department continues to state that the existing Criminal Conviction Review Group will handle applications until the Commission becomes operational. During this transitional period, the Minister of Justice retains the authority under the existing provisions to review eligible convictions and grant the statutory remedies.

Accordingly, the new statutory model should not be described as if it has already fully replaced the ministerial process in practice. The legislation is in force, but the operational arrangements remain transitional according to the Department’s published information. Ministère de la Justice+2

The reform is nevertheless a significant development in Canadian criminal justice. It moves the system toward an independent review institution with investigative powers and a specialised mandate, rather than leaving the extraordinary review process entirely within the executive branch.

Official information is available through the Department of Justice’s Miscarriage of Justice Review Commission page and the text of the Miscarriage of Justice Review Commission Act.

17. The remedies available when an appeal succeeds

Allowing an appeal does not always produce the same legal result. The remedy depends on the nature of the error, the strength of the remaining evidence, the procedural circumstances, and the powers conferred on the appellate court by the Criminal Code.

Section 686(2) provides that where an appeal against conviction is allowed, the court must quash the conviction and either direct that an acquittal be entered or order a new trial.

These are fundamentally different remedies.

17.1 Acquittal

An acquittal is appropriate where the legal and evidentiary circumstances justify bringing the prosecution to an end rather than requiring the accused to face another trial.

This may occur where the evidence cannot support a conviction, where the prosecution has failed to establish an essential element of the offence, or where the legal basis for continuing the prosecution has disappeared.

An acquittal is particularly important where a retrial would serve no legitimate purpose because the evidence, properly assessed, cannot establish guilt beyond a reasonable doubt.

It is also an important protection against unnecessary repeated prosecution. The criminal process should not subject an accused person to further proceedings merely because the prosecution wishes to make another attempt after failing to establish the case.

17.2 A new trial

A new trial may be ordered where the original proceedings were affected by an error that requires the case to be heard again, but the evidence and circumstances do not justify an immediate acquittal.

For example, a conviction may be quashed because the jury received an incorrect legal instruction, because important evidence was improperly excluded, or because a procedural irregularity undermined the fairness of the trial. If the prosecution case remains legally capable of supporting a conviction, a new trial may be appropriate.

A retrial does not mean that the accused is presumed guilty. The prosecution must prove the case again, and the accused retains the full protection of the presumption of innocence.

The new trial must also comply with the legal requirements identified by the appellate court. Where the original error concerned a particular evidentiary ruling or procedural issue, the new proceedings must address that defect.

17.3 Substitution of verdicts and other orders

The Criminal Code also gives appellate courts powers to substitute certain verdicts or make additional orders where the statutory conditions are satisfied.

For example, in an appeal against an acquittal, section 686(4) permits the court of appeal in defined circumstances to set aside the acquittal and enter a verdict of guilty, except where the original verdict was rendered by a court composed of a judge and jury. In other circumstances, the appropriate remedy may be a new trial.

Section 686(8) also permits an appellate court to make any additional order that justice requires when exercising the specified statutory powers.

These provisions demonstrate that appellate remedies are not purely formal. The court must select a result that responds to the legal error and the interests of justice while remaining within the statutory limits of its jurisdiction. laws-lois.justice.gc.ca

18. Crown appeals and the protection of acquitted persons

The prosecution also has statutory rights of appeal, but they are narrower than the rights available to a convicted person.

Section 676 of the Criminal Code governs appeals by the Attorney General in indictable proceedings. Among other matters, the Crown may appeal an acquittal on a question of law alone. It may also appeal certain orders or sentences where the statute permits.

The restriction to questions of law is significant. The prosecution cannot ordinarily appeal simply because it disagrees with the trial judge’s assessment of the evidence or believes that the jury should have reached a different factual conclusion.

The distinction reflects the presumption of innocence and the public interest in protecting individuals from repeated criminal proceedings. Once a person has been acquitted, the state must identify a recognised legal basis for challenging that result.

Where a Crown appeal against acquittal succeeds, the appellate court may order a new trial or, in certain circumstances, enter a verdict of guilt. The precise remedy is governed by section 686(4).

The Supreme Court has confirmed that the existence of a statutory Crown appeal does not automatically violate the protection against double jeopardy in section 11(h) of the Charter. In R. v. Hodgson, 2024 SCC 25, the Court considered the relationship between Crown appeals and the constitutional protection afforded to persons who have been acquitted.

The system therefore seeks to balance two principles: the need to correct a legal error that produced an acquittal and the need to protect an individual from unjustified repeated prosecution. A Crown appeal is a statutory exception within a controlled legal framework, not an unrestricted right to seek a second opportunity to prosecute.

19. Compensation and civil remedies for wrongful conviction

Setting aside a wrongful conviction does not automatically compensate the individual for the years spent in prison, the loss of income, the destruction of personal relationships, or the psychological and reputational harm suffered.

The correction of the conviction and compensation for its consequences are separate legal and policy questions.

Canada has historically relied on federal-provincial-territorial guidelines developed in 1988 for compensation in wrongful-conviction cases. These guidelines are not equivalent to a comprehensive statutory compensation scheme. Their application has been criticised as inconsistent, restrictive, and insufficiently responsive to the actual consequences of wrongful imprisonment.

The absence of a clear statutory framework creates uncertainty concerning eligibility, the required proof of innocence, the assessment of damages, and the relationship between compensation and civil proceedings.

19.1 International obligations

Article 14(6) of the International Covenant on Civil and Political Rights recognises a right to compensation in specified circumstances where a person has been finally convicted and punished, and the conviction is subsequently reversed or the person is pardoned because a newly discovered fact conclusively demonstrates a miscarriage of justice.

The provision contains an exception where the failure to disclose the unknown fact in time is wholly or partly attributable to the convicted person.

Canada is a party to the Covenant. Nevertheless, the absence of a comprehensive domestic statutory compensation system has been the subject of criticism in parliamentary research and international human rights discussions. library-biblio.parl.ca+1

19.2 Civil actions

A wrongfully convicted person may consider civil proceedings where the facts provide a recognised cause of action. Potential claims may involve negligence, misfeasance in public office, malicious prosecution, or other legally established grounds, depending on the conduct of the relevant authorities and the applicable provincial or territorial law.

However, a civil claim is not automatic merely because a conviction has been overturned. The claimant must establish the elements of the particular cause of action, including any applicable requirements concerning fault, causation, and damage.

A successful appeal does not necessarily establish that police officers, prosecutors, or other public officials committed a civil wrong. The criminal appeal asks whether the conviction can lawfully stand. Civil litigation asks a different set of legal questions and applies different rules of liability.

Charter damages may also be available in appropriate circumstances under section 24(1). The Supreme Court’s decision in Vancouver (City) v. Ward, 2010 SCC 27, established a general framework for Charter damages, including their potential purposes of compensation, vindication, and deterrence. Such damages remain subject to the legal requirements governing constitutional remedies.

19.3 The wider consequences of inadequate compensation

The consequences of wrongful conviction are not confined to imprisonment. Individuals may lose employment, housing, educational opportunities, savings, and contact with family members. They may also experience serious psychological harm and difficulty rebuilding their lives after release.

The passage of time may make rehabilitation particularly difficult. A person released after a lengthy wrongful imprisonment may return to a society in which family members have died, relationships have ended, professional qualifications have become outdated, and former social networks no longer exist.

A correction mechanism that restores legal status but offers no meaningful response to the consequences of wrongful imprisonment may therefore leave a substantial part of the injustice unresolved.

The question of compensation remains an important component of the broader Canadian debate about how the state should respond when its criminal justice institutions have wrongfully deprived an individual of liberty.

20. Preventing wrongful convictions: lessons for the criminal justice system

The correction of miscarriages of justice is essential, but an effective system should not rely exclusively on appeals and post-conviction review. The most important protection is to reduce the risk of wrongful conviction before it occurs.

The Canadian experience points to several institutional safeguards.

First, investigations must remain open to alternative explanations. Police should not treat the identification of a suspect as proof of guilt. Investigative decisions should be documented, contradictory evidence should be pursued, and alternative suspects should be considered where the evidence justifies it.

Second, disclosure obligations must be taken seriously. Relevant information should be preserved and disclosed in accordance with the law. Police and prosecutors should have systems that make it possible to identify information held across institutional boundaries.

Third, eyewitness identification procedures must be reliable. Identification methods should minimise suggestion, preserve the original account, and document the circumstances in which the identification occurred.

Fourth, expert evidence must be scientifically sound. Courts should scrutinise the methodology, limitations, assumptions, and degree of certainty expressed by experts. The authority of a witness must not substitute for the reliability of the evidence.

Fifth, vulnerable suspects must be protected during interrogation. The recording of interviews, access to legal advice, and careful assessment of the circumstances in which statements are obtained can reduce the risk of false confessions.

Sixth, prosecutorial independence must be accompanied by accountability. Crown counsel should remain committed to fairness and disclosure, including where new information weakens the case for conviction.

Seventh, defence representation must be effective. Accused persons must have a meaningful opportunity to challenge the prosecution’s evidence, obtain appropriate expert assistance, and present a defence.

Finally, post-conviction review must be accessible and capable of investigating serious concerns. A review institution cannot fulfil its mandate if applicants lack a realistic opportunity to obtain the records, expertise, and assistance necessary to demonstrate that a conviction may be unsafe.

The establishment of the Miscarriage of Justice Review Commission reflects the recognition that the correction of wrongful convictions requires specialised institutional attention. Its effectiveness will ultimately depend on its independence, resources, investigative powers, accessibility, and ability to respond to the particular difficulties faced by applicants.

21. The relationship between finality and the correction of injustice

Criminal proceedings cannot remain indefinitely open to challenge. Witnesses must be able to move forward, victims and their families must not be subjected to endless uncertainty, and courts must be able to bring disputes to a conclusion.

Finality is therefore a legitimate value in criminal justice. It supports institutional stability, protects the integrity of judgments, and prevents the criminal process from becoming an endless series of repeated proceedings.

However, finality cannot be treated as more important than justice itself. A legal system that refuses to reconsider a conviction despite compelling new evidence risks protecting the appearance of certainty at the expense of truth.

The challenge is to distinguish between ordinary disagreement with a judicial decision and a serious basis for believing that the conviction is unreliable or that the proceedings were fundamentally unjust.

The Canadian appellate system addresses this tension through several layers of review. Ordinary appeals correct legal and procedural errors. The Supreme Court provides final appellate supervision on questions of law of national importance. Fresh-evidence procedures permit the appellate courts to consider important material that was unavailable at trial. Extraordinary conviction-review mechanisms provide a further safeguard after conventional remedies have been exhausted.

These mechanisms are not interchangeable, and each has its own legal threshold. Together, however, they reflect a fundamental principle: the authority of a criminal conviction depends not merely on the fact that a court has entered it, but on whether it can withstand lawful and fair scrutiny.

A criminal justice system earns public confidence not by claiming that it never makes mistakes, but by maintaining the institutional capacity to recognise and correct them.

22. Key takeaways

• Criminal appeals in Canada are governed principally by the Criminal Code and applicable provincial and territorial court rules.
• A person convicted of an indictable offence may appeal on a question of law alone as of right, while appeals involving questions of fact or mixed law and fact generally require leave.
• Sentence appeals are distinct from appeals against conviction and are generally subject to leave requirements.
• The Supreme Court of Canada hears criminal appeals through statutory rights of appeal and discretionary leave procedures.
• Section 686 of the Criminal Code permits appellate intervention where a verdict is unreasonable, an error of law has occurred, or there has been a miscarriage of justice.
• The curative proviso allows an appeal court to dismiss an appeal in defined circumstances where an error of law did not result in a substantial wrong or miscarriage of justice.
• The Palmer test governs the admission of fresh evidence on appeal and considers due diligence, relevance, credibility, and potential effect on the result.
• DNA evidence may play an important role in correcting wrongful convictions, but its significance must be assessed in the context of the entire evidentiary record.
• Wrongful convictions may result from tunnel vision, eyewitness misidentification, false confessions, unreliable informants, incomplete disclosure, flawed forensic evidence, or inadequate defence representation.
• The Crown’s responsibility is to the administration of justice, not merely to securing or defending convictions.
• Crown appeals against acquittals are restricted by statute and generally concern questions of law.
• Section 11(h) of the Charter protects against double jeopardy, subject to the lawful operation of the criminal appeal system.
• Bill C-40, the Miscarriage of Justice Review Commission Act, received Royal Assent on 17 December 2024 and created a new independent review framework.
• According to the Department of Justice’s published information, the Commission is not yet operational, and the existing ministerial review process continues during the transition.
• Setting aside a conviction does not automatically provide compensation. Compensation and civil liability raise separate legal questions.
• The correction of wrongful convictions is essential, but prevention through reliable investigation, disclosure, scientific evidence, and fair trial procedures remains the first line of protection.

23. Frequently asked questions

1. Can a person appeal a criminal conviction in Canada?

Yes. The Criminal Code provides statutory rights of appeal for persons convicted of criminal offences. The available grounds, the need for leave, and the applicable procedure depend on the nature of the offence and the court that entered the conviction.

2. Can a person appeal a conviction simply because they disagree with the judge?

Not ordinarily. An appeal must rely on a recognised legal ground, such as an error of law, an unreasonable verdict, or a miscarriage of justice. A disagreement with the trial judge’s assessment of evidence does not automatically justify appellate intervention.

3. Which court hears criminal appeals in Canada?

The ordinary appeal from an indictable conviction is generally heard by the court of appeal of the relevant province or territory. Further appeals may reach the Supreme Court of Canada where the statutory requirements are satisfied.

4. Does every criminal appeal require leave?

No. Under section 675, a person convicted of an indictable offence may appeal on a question of law alone. Appeals involving questions of fact or mixed law and fact generally require leave or the trial judge’s certificate. Sentence appeals also generally require leave unless the sentence is fixed by law.

5. Can the Supreme Court of Canada hear every criminal appeal?

No. The Supreme Court’s criminal appellate jurisdiction is governed by statute. Some appeals may proceed as of right on a qualifying dissent on a question of law, while many others require leave. The Court selects cases that justify its attention under the applicable legal framework.

6. What is an unreasonable verdict?

An unreasonable verdict is one that cannot reasonably be supported by the evidence when considered as a whole. The appellate court examines whether a properly instructed trier of fact could reasonably have reached the conclusion that resulted in conviction.

7. What is a miscarriage of justice?

A miscarriage of justice is a serious failure in the criminal process that makes it unjust to allow the result to stand. It may involve a wrongful conviction, a fundamentally unfair trial, serious procedural errors, or a combination of failures that undermines the integrity of the proceedings.

8. Can new evidence be introduced during a criminal appeal?

Yes, in appropriate circumstances. The court applies the principles in Palmer v. The Queen, considering due diligence, relevance, credibility, and whether the evidence could reasonably have affected the original result.

9. Does new DNA evidence automatically overturn a conviction?

No. DNA evidence must be assessed for reliability, relevance, and its significance in the context of the entire case. It may strongly support an appeal, but the legal consequences depend on the evidence and the applicable statutory grounds.

10. What happens if a criminal appeal succeeds?

The appellate court may quash the conviction and order an acquittal or a new trial. It may also make other orders authorised by the Criminal Code, depending on the circumstances.

11. Can the Crown appeal an acquittal?

Yes, but only within the statutory limits. Crown appeals against acquittals in indictable proceedings are generally restricted to questions of law alone. The prosecution cannot simply seek a new trial because it disagrees with the factual result.

12. What is tunnel vision in a criminal investigation?

Tunnel vision occurs when investigators or prosecutors become excessively committed to one theory of guilt and interpret evidence in a way that reinforces it. Contradictory evidence and alternative explanations may consequently be overlooked or undervalued.

13. What are jailhouse informants?

Jailhouse informants are persons in custody who claim that another accused or convicted person made an incriminating statement. Their evidence may require particular scrutiny where they expect benefits or favourable treatment in exchange for cooperation.

14. Can a person who pleaded guilty later challenge the conviction?

Yes, in appropriate circumstances. A guilty plea does not make a conviction immune from review. A person may challenge the legal validity of the plea or rely on significant new information suggesting that a miscarriage of justice occurred, subject to the applicable statutory and procedural requirements.

15. Can a person apply for a review after all ordinary appeals have ended?

Yes. The exceptional conviction-review framework is designed for eligible applicants who have exhausted their ordinary rights of appeal or judicial review. The current transitional process is administered through the Department of Justice, pending the operational commencement of the independent Commission.

16. What is the Miscarriage of Justice Review Commission?

It is an independent body established by the Miscarriage of Justice Review Commission Act (David and Joyce Milgaard’s Law). Its mandate is to review and investigate applications alleging miscarriages of justice and determine whether cases should be returned to the judicial system.

17. Is the Commission already handling applications?

The Department of Justice’s published information states that the existing Criminal Conviction Review Group continues to handle applications until the Commission becomes operational. The Minister of Justice retains the relevant review authority during this transitional period.

18. Can the Minister of Justice order a new trial?

Under the existing ministerial review regime, the Minister may order a new trial or refer a matter to the court of appeal where the statutory threshold is met. This is an extraordinary remedy, not an ordinary appeal.

19. Does an overturned conviction mean that the person has been declared innocent?

Not necessarily. An appellate court may overturn a conviction because of a legal or procedural error without making a formal determination of factual innocence. An acquittal means that guilt has not been established beyond a reasonable doubt; it is not always a declaration of factual innocence.

20. Is a wrongfully convicted person automatically entitled to compensation?

No. The reversal of a conviction does not automatically produce compensation. Eligibility may depend on applicable government guidelines, civil liability principles, constitutional remedies, and the circumstances of the case. Canada has been criticised for not having a comprehensive statutory compensation framework.

21. Can a wrongfully convicted person sue the police or prosecution?

Potentially, but the claimant must establish the requirements of a recognised civil cause of action. The fact that a conviction was overturned does not, by itself, establish negligence, malicious prosecution, misfeasance in public office, or another civil wrong.

22. Does the Charter guarantee an unlimited right of appeal?

No. The Charter protects fundamental rights relevant to criminal proceedings, including the presumption of innocence and protection against double jeopardy. The specific statutory rights of appeal are established principally by the Criminal Code and related legislation.

23. Can a criminal conviction be challenged because the defence lawyer performed poorly?

Yes, where the alleged deficiencies meet the legal test for ineffective assistance of counsel and resulted in a miscarriage of justice. An unsuccessful defence or an imperfect strategic decision is not automatically sufficient.

24. Why is fresh evidence important in wrongful-conviction cases?

Fresh evidence may reveal that the original conviction rested on incomplete, unreliable, or misleading information. It may include new forensic results, previously undisclosed records, witness recantations, or evidence identifying another possible perpetrator.

25. Why are criminal appeals and conviction reviews important to public confidence?

They demonstrate that the criminal justice system recognises the possibility of error and provides lawful mechanisms to correct it. The ability to review and overturn an unsafe conviction is an essential part of the legitimacy of criminal punishment and the rule of law.

24. Principal legislation, cases, and official resources

Principal legislation

Legislation	Relevance
Constitution Act, 1982 – Canadian Charter of Rights and Freedoms	Presumption of innocence, fair trial, double jeopardy, and constitutional remedies
Criminal Code	Criminal appeals, Crown appeals, appellate remedies, and conviction review
Criminal Code, section 675	Appeals by persons convicted of indictable offences
Criminal Code, section 686	Powers of courts of appeal and remedies
Criminal Code, section 691	Appeals to the Supreme Court of Canada
Miscarriage of Justice Review Commission Act, 2024	Establishment and statutory framework of the independent Commission

Important judicial decisions

Decision	Legal significance
Palmer v. The Queen, [1980] 1 S.C.R. 759	Four-part test for admission of fresh evidence
R. v. Yebes, [1987] 2 S.C.R. 168	Appellate assessment of unreasonable verdicts
R. v. Stinchcombe, [1991] 3 S.C.R. 326	Crown disclosure obligations
R. v. Biniaris, 2000 SCC 15	Appellate review of unreasonable jury verdicts
R. v. McNeil, 2009 SCC 3	Relevant police-held information and disclosure
Vancouver (City) v. Ward, 2010 SCC 27	Framework for Charter damages
R. v. W.H., 2013 SCC 22	Appellate assessment of the reasonableness of a verdict
R. v. Sipos, 2014 SCC 47	Fresh evidence and appellate review
R. v. Hodgson, 2024 SCC 25	Crown appeals and section 11(h) of the Charter

Official institutional resources

• Supreme Court of Canada – Judgments
• Department of Justice Canada – Criminal Conviction Review
• Department of Justice Canada – Miscarriage of Justice Review Commission
• Public Prosecution Service of Canada – Prevention of Wrongful Convictions
• Library of Parliament – Wrongful Convictions in Canada
• Parliament of Canada – Bill C-40, Royal Assent

Conclusion

Criminal appeals and post-conviction review are indispensable components of the Canadian criminal justice system. They recognise that even carefully conducted trials may contain legal errors, that evidence may later prove unreliable, and that institutional failures may sometimes result in the conviction of an innocent person.

The appellate framework established by the Criminal Code provides a structured means of correcting errors. Provincial and territorial courts of appeal review convictions and sentences, while the Supreme Court of Canada provides final appellate supervision on questions of law of national importance. The statutory powers to quash convictions, order new trials, enter acquittals, and make other appropriate orders allow courts to respond to different forms of injustice.

The problem of wrongful convictions, however, extends beyond ordinary appellate errors. Canadian public inquiries have shown that tunnel vision, racial prejudice, unreliable witnesses, false confessions, incomplete disclosure, and flawed forensic evidence may combine to undermine the reliability of criminal proceedings. These failures demonstrate the importance of institutional accountability and effective safeguards throughout the investigative and prosecutorial process.

The enactment of the Miscarriage of Justice Review Commission Act represents a major legislative development. By creating an independent institution with investigative powers and a specialised mandate, Parliament has recognised that extraordinary review should be capable of operating beyond the ordinary political and departmental structures of criminal justice. The practical success of the reform will depend on the Commission’s operational independence, resources, accessibility, and ability to investigate serious claims effectively.

Ultimately, the legitimacy of criminal punishment rests on the reliability and fairness of the process through which guilt is established. A conviction must not become unquestionable merely because the ordinary proceedings have ended. The rule of law requires both respect for final judgments and a continuing commitment to correct those that cannot withstand proper scrutiny. A justice system is strongest not when it denies the possibility of error, but when it possesses the courage, independence, and legal mechanisms necessary to correct it.