Duress vs. Necessity in Criminal Law

Duress vs. Necessity in Criminal Law

Duress and necessity are two important defenses in criminal law that excuse or justify conduct that would otherwise constitute a crime.

They can appear similar because both involve a defendant who claims:

“I committed the act because I had no reasonable alternative.”

But the source of the pressure is different.

Duress generally involves another person threatening the defendant or someone else with serious harm.

Necessity generally involves circumstances creating a danger, such as a natural disaster, medical emergency, or other threatening situation, in which the defendant chooses the lesser harm.

The distinction can be summarized simply:

Duress: “Another person forced me.”

Necessity: “The circumstances left me with no reasonable alternative.”

The distinction matters because the elements, limitations, and availability of these defenses can differ substantially by jurisdiction.

Cornell Legal Information Institute — Duress

Cornell Legal Information Institute — Necessity Defense

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1. What Is Duress?

Duress is a criminal defense based on coercion.

The defendant argues that another person threatened serious harm and that the threat caused the defendant to engage in criminal conduct.

For example:

A criminal organization threatens to kill a person’s child unless the person drives a getaway vehicle after a robbery.

The person drives the vehicle.

The defendant may argue that the conduct occurred under duress.

The central idea is that the defendant’s choice was constrained by a sufficiently serious threat.

Duress is therefore closely connected to:

• coercion;
• threats;
• fear;
• compulsion;
• lack of meaningful choice.

Cornell Legal Information Institute — Duress

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2. What Is Necessity?

Necessity is generally a defense based on circumstances rather than human coercion.

The defendant argues that an otherwise criminal act was necessary to prevent a greater harm.

For example:

A driver sees an unconscious person trapped inside a burning vehicle. The driver breaks the window of another person’s parked car to obtain equipment needed to rescue the victim.

The driver may argue that the property damage was necessary to prevent a much greater harm.

The basic principle is often described as the lesser-evil or choice-of-evils doctrine.

The defendant claims that violating one legal rule was necessary to prevent a more serious harm.

Cornell Legal Information Institute — Necessity Defense

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3. The Fundamental Difference

The most important distinction is the source of the pressure.

Duress

The pressure comes from another person.

“If you do not commit this crime, I will seriously harm you or someone you care about.”

Necessity

The pressure comes from circumstances.

“If I do not violate this law, a greater harm will occur.”

This distinction is not merely semantic.

It reflects two different theories of criminal responsibility.

Duress asks whether the defendant’s freedom of choice was overcome by coercion.

Necessity asks whether the defendant’s conduct was justified because it prevented a greater harm.

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4. Duress Is About Coercion

The central concept in duress is coercion.

The defendant is not necessarily claiming that the criminal act was morally or legally desirable.

Instead, the defendant argues that the threat made compliance with the criminal demand the only realistically available option.

Consider:

“Give me the money or I will kill your child.”

If the defendant steals money and gives it to the threatening person, the defendant may argue duress.

The important fact is not simply that the defendant feared something.

It is that another person created the threat and used it to compel the defendant’s conduct.

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5. Necessity Is About Choosing Between Harms

Necessity operates differently.

There may be no threatening person at all.

Instead, the defendant faces competing harms.

For example:

A person breaks into an abandoned building during a severe winter storm because remaining outside would create a serious risk of death.

The person technically commits trespass.

But the defense argues:

“Remaining outside would have exposed me to a much greater danger.”

The question becomes whether the criminal act was reasonably necessary to prevent the greater harm.

Necessity therefore involves a comparison:

Harm caused by the defendant’s conduct

versus

Harm avoided by that conduct.

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6. Duress Usually Involves a Human Threat

A classic duress case involves a threat from another person.

Examples include threats to:

• kill the defendant;
• seriously injure the defendant;
• kill or injure a family member;
• cause other serious bodily harm.

The precise requirements vary by jurisdiction.

Some legal systems require an immediate or imminent threat. Others apply somewhat different standards.

The key point is that the threat originates with a coercive actor.

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7. Necessity Can Arise Without a Human Threat

Necessity can arise from circumstances such as:

• natural disasters;
• fires;
• floods;
• medical emergencies;
• extreme weather;
• dangerous accidents;
• other emergencies.

For example:

A person drives through a restricted area to escape an approaching wildfire.

There may be no person threatening the driver.

The emergency itself creates the pressure.

That is characteristic of necessity rather than classic duress.

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8. Duress and the Defendant’s Choice

Duress focuses heavily on the defendant’s ability to choose freely.

The defendant may argue:

“I chose the criminal act because the alternative was being killed or watching someone else be seriously harmed.”

The law must determine whether the threat was sufficiently serious to undermine criminal responsibility.

This creates a difficult question:

How much pressure is enough to excuse criminal conduct?

The law generally does not recognize every fear or inconvenience as duress.

The threat must ordinarily be sufficiently serious under the applicable legal standard.

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9. Necessity and the Lesser Evil

Necessity focuses on whether the defendant chose the lesser harm.

Suppose a person breaks into a house to rescue someone trapped inside a fire.

The person causes property damage.

The defense may argue:

Property damage < serious risk to human life

If the legal requirements are satisfied, the conduct may be justified.

The underlying principle is that criminal law should not necessarily punish someone for violating a lesser legal interest when doing so was reasonably necessary to prevent a substantially greater harm.

Cornell Legal Information Institute — Necessity Defense

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10. Duress Is Usually an Excuse

Duress is traditionally understood primarily as an excuse.

The law may recognize that the defendant committed the prohibited act but conclude that the defendant should not be held fully responsible because the defendant acted under overwhelming coercion.

The conduct itself may remain wrongful.

The defendant is excused because of the circumstances under which the conduct occurred.

This distinction is important.

An excuse says, in substance:

“The conduct was wrong, but this defendant should not be blamed in the ordinary way.”

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11. Necessity Is Often a Justification

Necessity is traditionally understood primarily as a justification.

The argument is different:

“Given the circumstances, this conduct was the legally preferable choice because it prevented a greater harm.”

The law is not necessarily saying:

“You did something wrong but we forgive you.”

Instead, it may be saying:

“Under these circumstances, the conduct was justified.”

Cornell Legal Information Institute — Justification

This is one of the most important conceptual distinctions between the two defenses.

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12. Excuse vs. Justification

The distinction can be illustrated through two examples.

Duress

A person is forced at gunpoint to drive a getaway vehicle.

The law may say:

“Driving the vehicle was criminal conduct, but the defendant acted under coercion.”

That is an excuse.

Necessity

A person breaks into a building to rescue a child from a deadly fire.

The law may say:

“Breaking into the building was justified because it prevented a greater harm.”

That is a justification.

Thus:

Duress → primarily excuse

Necessity → primarily justification

The distinction can become more complicated under particular statutes and jurisdictions, but it provides the basic conceptual framework.

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13. The Elements of Duress

The exact elements vary, but a duress defense commonly requires some combination of the following:

1. A Serious Threat

The defendant was subjected to a threat of serious harm.

2. Coercive Pressure

The threat was sufficiently powerful to constrain the defendant’s choice.

3. Reasonable Belief

The defendant generally must have believed that the threat was real and sufficiently serious.

4. Imminence or Adequacy of the Threat

Many jurisdictions require an imminent or sufficiently immediate threat, although the precise formulation varies.

5. Lack of Reasonable Escape

The defendant may need to show that there was no reasonable opportunity to avoid the threatened harm without committing the offense.

6. Causal Connection

The threat must have caused or substantially contributed to the defendant’s criminal conduct.

Cornell Legal Information Institute — Duress

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14. The Elements of Necessity

Necessity generally requires some combination of:

1. A Significant Threat of Harm

The defendant faced a serious danger.

2. Reasonable Belief

The defendant reasonably believed that the threatened harm existed.

3. Imminence

The danger generally must be sufficiently immediate to justify action.

4. No Adequate Lawful Alternative

The defendant had no reasonable legal alternative to the criminal conduct.

5. Proportionality

The harm caused by the defendant’s conduct must not be greater than the harm sought to be avoided.

6. Causal Connection

The criminal act must have been reasonably connected to preventing the threatened harm.

Cornell Legal Information Institute — Necessity Defense

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15. The Role of Imminence

Imminence is important in both defenses, but it operates differently.

In duress:

“The person threatening me is about to kill me unless I do this.”

In necessity:

“This emergency is about to cause serious harm unless I act now.”

The law generally does not allow defendants to invoke these defenses based on vague future dangers.

The emergency must generally be sufficiently immediate that criminal conduct appears necessary to avoid the threatened harm.

The precise definition of imminence varies by jurisdiction.

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16. The Reasonable Alternative Requirement

Both defenses can involve an important question:

Could the defendant have avoided the criminal conduct?

Suppose a person is threatened by a criminal organization.

The defendant could potentially:

• call the police;
• leave the area;
• seek protection;
• warn the intended victim;
• refuse to participate.

If a realistic and safe alternative existed, the duress defense may become weaker.

Necessity presents a similar question.

If a person can safely rescue a victim without committing a crime, breaking the law may not be considered necessary.

Thus:

No reasonable alternative → stronger defense

Reasonable lawful alternative → weaker defense

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17. The Difference Between Threat and Emergency

This distinction provides an excellent analytical test.

Ask:

Who or what created the danger?

If the answer is:

Another human being → consider duress.

If the answer is:

Natural or circumstantial emergency → consider necessity.

For example:

Armed Threat

“Steal this car or I will shoot you.”

→ Duress

Wildfire

“Drive through a restricted area or remain in the path of the wildfire.”

→ Necessity

Flood

“Break into the building or remain in rapidly rising water.”

→ Necessity

Kidnapper

“Transport the package or your family will be killed.”

→ Duress

The distinction becomes much easier once the source of the pressure is identified.

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18. Duress Does Not Necessarily Require the Defendant to Be at Fault

A defendant may be placed under coercion unexpectedly.

For example:

A person is kidnapped by criminals and forced to assist them.

The person may have had no involvement in the criminal organization before the threat.

This can provide a classic duress scenario.

However, a defendant’s own conduct can complicate the defense.

If someone voluntarily joins a criminal organization and later claims that participation was coerced, the legal analysis may become more complicated depending on the jurisdiction and circumstances.

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19. Necessity and Creating the Emergency

Necessity can also become unavailable or weakened if the defendant wrongfully created the emergency.

Suppose a person intentionally starts a dangerous fire and then claims necessity when breaking into a building to escape the consequences.

The defendant’s responsibility for creating the danger may undermine the defense.

The law generally does not favor creating an emergency and then using that emergency as a justification for criminal conduct.

The precise rules vary, but the defendant’s role in creating the circumstances can be highly relevant.

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20. Duress and Murder

One of the most important differences between duress and necessity concerns serious violent crimes.

Under traditional common-law principles, duress generally has severe limitations when the defendant is charged with intentional killing.

The historical rationale is that a person should not ordinarily be permitted to intentionally kill an innocent person simply because another person threatened the defendant.

Modern statutes and jurisdictions differ, and the exact rules must therefore be checked carefully.

But the issue illustrates an important principle:

The seriousness of the crime can limit the availability of a defense.

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21. Necessity and Homicide

Necessity also presents particularly difficult questions when the defendant causes death.

Suppose a person kills one innocent person in order to save several other people.

The philosophical argument is straightforward:

“One life was sacrificed to save five.”

But criminal law does not automatically accept numerical calculations of human life.

Many jurisdictions impose significant limitations on necessity when the defendant intentionally kills an innocent person.

This illustrates the limits of the lesser-evil principle.

The fact that one harm is numerically greater does not necessarily mean that the law permits a person to intentionally impose the lesser harm on an innocent victim.

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22. Duress vs. Necessity in Homicide

This is one of the most important distinctions.

Suppose an armed person says:

“Kill the person next to you or I will kill you.”

That is a duress situation.

Now imagine a lifeboat that cannot support everyone aboard and someone intentionally throws one passenger into the water to save the others.

That is closer to a necessity or lesser-evil problem.

The two scenarios raise very different questions.

Duress asks:

Can coercion excuse the defendant’s conduct?

Necessity asks:

Can preventing a greater harm justify the defendant’s conduct?

Neither question automatically produces an affirmative defense to homicide.

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23. Duress vs. Self-Defense

Duress can also be confused with self-defense.

Self-defense generally involves using force to protect oneself or another person from unlawful force.

Cornell Legal Information Institute — Self-Defense

Duress is different.

A person might commit a crime because someone threatens future harm.

For example:

“Drive this car or I will kill you.”

The defendant may invoke duress.

Self-defense would instead involve responding directly to unlawful force.

For example:

“The attacker is trying to kill me, so I use reasonable force to stop the attack.”

The distinctions can be summarized:

Self-defense: force used to stop unlawful force.

Duress: criminal conduct committed because of coercive threats.

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24. Duress vs. Necessity vs. Self-Defense

These three defenses can be compared as follows:

Defense	Source of danger	Basic theory
Duress	Another person	Coercion/excuse
Necessity	Circumstances	Lesser evil/justification
Self-defense	Another person’s unlawful force	Protection against unlawful force

The same factual situation can sometimes raise more than one defense, but the legal requirements remain distinct.

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25. Duress vs. Entrapment

Duress is also different from entrapment.

Entrapment generally concerns government inducement of criminal conduct.

Cornell Legal Information Institute — Entrapment

Duress concerns coercion through threats or other pressure.

For example:

“A criminal threatened me with death unless I transported drugs.”

→ Duress

But:

“An undercover government agent repeatedly persuaded me to commit a crime that I was not predisposed to commit.”

→ potentially Entrapment

The source of the pressure is therefore critical.

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26. Can Both Defenses Apply?

Sometimes the facts may potentially support arguments involving both duress and necessity.

Consider a defendant who is fleeing a criminal organization while a natural disaster is occurring.

The defendant may have:

• a human threat;
• an environmental emergency.

Different acts may therefore implicate different defenses.

But the defendant cannot simply label every emergency “necessity” or every fear “duress.”

The elements of the relevant defense must be established.

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27. Evidence in Duress Cases

Evidence supporting duress may include:

• threatening messages;
• recordings;
• witness testimony;
• police reports;
• prior threats;
• evidence of violence;
• communications between the defendant and coercer;
• evidence concerning the defendant’s relationship with the threatening person;
• evidence of attempts to escape or seek assistance.

The defense must connect the threat to the criminal conduct.

A general fear of a dangerous person may not be enough.

The defendant generally needs to demonstrate that the coercion materially caused the criminal conduct.

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28. Evidence in Necessity Cases

Evidence supporting necessity may include:

• emergency recordings;
• photographs;
• weather records;
• medical evidence;
• fire or disaster reports;
• eyewitness testimony;
• communications;
• expert testimony;
• evidence concerning available alternatives;
• evidence concerning the seriousness of the threatened harm.

The central factual questions are often:

Was the danger real?

Was it sufficiently immediate?

Was the defendant’s belief reasonable?

Was the criminal act necessary?

Was the harm avoided greater than the harm caused?

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29. The Problem of Hindsight

Both defenses can be distorted by hindsight.

After the emergency has ended, it may seem obvious that another option existed.

But criminal law may need to evaluate the defendant’s conduct from the perspective of the circumstances as they appeared at the time.

Suppose a person breaks a window because they reasonably believe a child is trapped inside a burning building.

Afterward, investigators discover that the child had already escaped through another door.

The fact that the defendant was mistaken does not necessarily resolve the legal question.

The reasonableness of the defendant’s belief and the circumstances confronting the defendant at the time may be crucial.

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30. Reasonable Belief and Mistake

Both duress and necessity can involve mistaken beliefs.

A defendant may honestly believe:

“If I do not act, someone will die.”

But the belief may later prove incorrect.

The legal significance depends on whether the mistake was reasonable and on the applicable jurisdiction’s requirements.

This is one reason necessity and duress overlap with broader criminal-law doctrines concerning:

• mistake of fact;
• reasonableness;
• mens rea;
• culpability.

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31. The Model Penal Code Approach

The Model Penal Code (MPC) provides an important framework for understanding defenses, although it is not itself binding law unless adopted by a jurisdiction.

The MPC’s treatment of necessity is associated with the principle that conduct otherwise constituting an offense may be justified when the actor believes it necessary to avoid a harm or evil to the person or another, subject to specified limitations.

Cornell Legal Information Institute — Model Penal Code

The MPC also provides an important formulation of duress based on the use of unlawful force or threat of unlawful force that a person of reasonable firmness in the actor’s situation would have been unable to resist.

The MPC framework therefore helps demonstrate the conceptual distinction:

Necessity → choice between competing harms

Duress → inability to resist coercive pressure

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32. Objective and Subjective Elements

Both defenses can contain subjective and objective components.

Subjective Question

What did the defendant actually believe?

Objective Question

Was that belief or response reasonable under the circumstances?

For example:

A defendant may sincerely believe that a threat is deadly.

But if no reasonable person in the circumstances would have perceived serious danger, the defense may fail.

Similarly, a person may sincerely believe that breaking into a building was necessary, but if a safe and obvious alternative existed, necessity may be unavailable.

The precise balance between subjective and objective standards depends on the jurisdiction.

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33. The Role of Reasonable Alternatives

One of the most useful ways to distinguish these defenses is to ask:

What alternatives were realistically available?

In a duress case:

Could the defendant safely escape the coercer?

Could the defendant contact authorities?

Could the defendant protect the threatened person without committing the crime?

In a necessity case:

Could the defendant avoid the danger lawfully?

Could the defendant obtain help?

Could the defendant protect the victim without causing the criminal harm?

The more realistic lawful alternatives existed, the harder it may be to establish the defense.

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34. Duress and Necessity Are Not Permission to Break the Law Whenever Life Is Difficult

These defenses have limits.

Financial hardship, embarrassment, inconvenience, fear of losing employment, or ordinary personal pressure generally do not automatically create duress or necessity.

The law requires a sufficiently serious situation.

For example:

“I stole money because I was struggling financially.”

is ordinarily not necessity.

Likewise:

“My employer threatened to fire me if I did not falsify the document.”

does not necessarily constitute criminal duress.

The seriousness of the threatened harm and the relationship between the threat and the criminal conduct are essential.

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35. A Practical Comparison

Consider the following scenarios.

Scenario A

A person points a gun at the defendant and orders the defendant to rob a store.

Likely defense: Duress.

Scenario B

A flood traps the defendant in a building. The defendant breaks into a neighboring building to reach safety.

Likely defense: Necessity.

Scenario C

A person attacks the defendant with a knife, and the defendant uses reasonable force to stop the attack.

Likely defense: Self-defense.

Scenario D

A person threatens to kill the defendant unless the defendant drives a vehicle to a specified location.

Likely defense: Duress.

Scenario E

A defendant drives through a restricted road because an approaching wildfire makes the normal route dangerously unusable.

Likely defense: Necessity.

The identity of the source of danger often provides the first step in classification.

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36. A Practical Framework for Examining Duress vs. Necessity

When analyzing a problem, proceed systematically.

Step 1: Identify the Criminal Act

What did the defendant do that would otherwise constitute a crime?

Step 2: Identify the Source of Pressure

Was the defendant responding to:

• another person’s threat, or
• an emergency circumstance?

This is often the key distinction.

Step 3: Consider Duress

If another person created the danger, determine whether the elements of duress are satisfied.

Step 4: Consider Necessity

If circumstances created the danger, determine whether the elements of necessity are satisfied.

Step 5: Determine the Required Mental State

What did the defendant actually believe?

Step 6: Test Reasonableness

Was that belief or response reasonable under the applicable legal standard?

Step 7: Examine Imminence

Was the threatened harm sufficiently immediate?

Step 8: Examine Alternatives

Was there a reasonable lawful alternative?

Step 9: Compare Harms

For necessity, was the harm caused smaller than or sufficiently outweighed by the harm avoided?

Step 10: Check Crime-Specific Limitations

Does the jurisdiction restrict the defense for particularly serious offenses?

Step 11: Consider Other Defenses

Could self-defense, mistake, insanity, entrapment, or another defense apply?

Step 12: Apply the Jurisdiction’s Rules

Duress and necessity differ significantly among jurisdictions. The governing statute and case law must control.

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37. Common Misunderstandings

“Duress and necessity are the same defense.”

No. Duress generally concerns coercion by another person; necessity generally concerns circumstances creating a choice between harms.

“Necessity means anything is legal during an emergency.”

No. The criminal act must generally be necessary, proportionate, and undertaken to prevent a sufficiently serious harm.

“Fear automatically establishes duress.”

No. The threat must generally satisfy specific legal requirements concerning seriousness, reasonableness, imminence, and causation.

“Necessity always applies when the defendant saves a life.”

Not necessarily. The defense has limitations, particularly where the defendant intentionally harms another innocent person.

“Duress is a justification.”

Traditionally, duress is primarily an excuse, whereas necessity is traditionally a justification.

“Necessity requires another person to threaten the defendant.”

No. Necessity can arise from natural or circumstantial emergencies.

“A defendant must always choose the option that causes the least physical harm.”

The legal standard is more nuanced. Courts apply the jurisdiction’s particular proportionality and necessity rules.

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38. The Deeper Principle: Freedom of Choice

The distinction between duress and necessity ultimately concerns the nature of criminal responsibility.

Criminal law generally assumes that people are responsible because they can choose how to act.

Duress challenges that assumption by saying:

The defendant’s freedom of choice was overwhelmed by coercion.

Necessity approaches the problem differently:

The defendant confronted circumstances in which every available option involved harm, and the defendant chose the legally preferable alternative.

Thus:

Duress asks whether the defendant should be excused because the defendant’s choice was coerced.

Necessity asks whether the defendant’s choice was justified because it prevented a greater harm.

That distinction explains why the two defenses can produce different legal results even when the factual circumstances appear similar.

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39. The Moral Dimension

These defenses also reveal a deeper philosophical problem.

Imagine that a person is threatened with death unless they commit a minor property offense.

Most people would regard the person’s criminal responsibility as substantially reduced.

Now imagine a person steals medicine because a child will otherwise die.

Again, many people would hesitate to impose ordinary criminal punishment.

But the reasons are different.

In the first case:

The defendant was coerced.

In the second:

The defendant chose the lesser harm.

Criminal law therefore distinguishes between excusing a person and justifying conduct.

That distinction is one of the most important ideas in the general theory of criminal defenses.

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40. Why the Distinction Matters

The distinction between duress and necessity is not merely academic.

It affects:

• what facts must be proven;
• what evidence is relevant;
• whether the defense is legally available;
• whether the defense is an excuse or justification;
• whether the defense applies to particular crimes;
• how the defendant’s conduct is characterized;
• how courts evaluate proportionality;
• how criminal responsibility is assigned.

A good legal analysis should therefore never simply state:

“The defendant was under pressure.”

Instead, it should ask:

What created the pressure?

That single question often determines whether the analysis begins with duress, necessity, self-defense, or another defense.

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Key Takeaways

• Duress and necessity are distinct criminal defenses.
• Duress generally involves coercion or threats from another person.
• Necessity generally involves an emergency or other circumstances creating a choice between harms.
• Duress is traditionally an excuse.
• Necessity is traditionally a justification.
• Duress focuses on whether the defendant’s freedom of choice was overcome by coercion.
• Necessity focuses on whether the defendant’s conduct was reasonably necessary to prevent a greater harm.
• Both defenses may involve questions of reasonableness, imminence, proportionality, and reasonable alternatives.
• The availability of each defense varies by jurisdiction.
• Both defenses may face special limitations when the defendant intentionally causes death or commits other particularly serious offenses.
• Self-defense differs from both because it generally concerns the use of force to resist unlawful force.
• The central analytical question is where the pressure came from and why the defendant acted as they did.

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Frequently Asked Questions

What is the main difference between duress and necessity?

Duress generally involves a threat or coercion from another person. Necessity generally involves circumstances that force the defendant to choose between competing harms.

Is duress an excuse or a justification?

Traditionally, duress is an excuse. The conduct remains wrongful, but the defendant may be excused because coercion undermined meaningful choice.

Is necessity an excuse or a justification?

Necessity is traditionally a justification because the defendant argues that the criminal conduct was the lesser evil under the circumstances.

Can duress and necessity apply to the same case?

Potentially, depending on the facts and jurisdiction. Different acts within the same case may involve different defenses.

Does duress require a threat of death?

Not necessarily in every jurisdiction. The threat generally must be sufficiently serious to satisfy the applicable legal standard.

Does necessity require an emergency?

Necessity generally involves a sufficiently serious and immediate danger, although the exact statutory requirements vary.

Can necessity justify killing another person?

The answer varies by jurisdiction, and many legal systems impose significant limitations on necessity when an innocent person is intentionally killed.

Can duress excuse murder?

Traditional common-law doctrine generally places severe limitations on duress as a defense to intentional killing. Modern law varies by jurisdiction.

What is the easiest way to remember the distinction?

Think:

Duress = “Someone forced me.”

Necessity = “The circumstances left me with the lesser evil.”

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Conclusion

Duress and necessity both address situations in which ordinary criminal responsibility seems difficult to apply because the defendant faced extraordinary pressure.

But they answer fundamentally different questions.

Duress focuses on the loss of meaningful freedom through coercion:

“Another person threatened me, and I committed the offense because I could not reasonably resist.”

Necessity focuses on the choice between competing harms:

“The circumstances forced me to choose between harmful alternatives, and I chose the option that prevented the greater harm.”

That distinction produces the traditional difference between excuse and justification.

Duress generally says:

The conduct was wrong, but the defendant should not be blamed in the ordinary way.

Necessity generally says:

Under these circumstances, the conduct was justified because it prevented a greater harm.

Neither defense gives people a general license to violate criminal law whenever they face difficulty. Both are carefully limited by requirements concerning seriousness, reasonableness, imminence, causation, alternatives, proportionality, and the particular crime involved.

Ultimately, the distinction reflects a central question of criminal law:

When does extraordinary pressure make a person less blameworthy, and when does it make otherwise criminal conduct legally justified?

Duress and necessity provide two different answers to that question—and understanding the difference is essential to understanding the boundaries of criminal responsibility.