Module 2: Arrest, Detention & the Rights of the Accused

A lawful arrest requires probable cause plus an actual restraint of liberty (custody) — through a warrant where required, or a valid warrantless arrest where the law permits one, with felony and misdemeanor warrantless authority traditionally differing.

Atwater v. City of Lago Vista, 532 U.S. 318 (2001), confirms just how far warrantless misdemeanor arrest authority actually reaches. An officer stopped a woman for driving without her children buckled into seatbelts — a minor traffic offense punishable, under state law, only by a fine, with no possible jail time at all — and arrested her, handcuffing her in front of her own young children and taking her to the police station. She argued that a full custodial arrest for such a minor, fine-only offense was constitutionally unreasonable, even though probable cause plainly existed. The Supreme Court disagreed, holding that if an officer has probable cause to believe a person has committed even a very minor criminal offense in their presence, the Fourth Amendment permits a full custodial arrest, regardless of how minor the offense or how available a citation alternative might have been. The Court acknowledged the arrest was, in its own words, “gratuitous” and poor judgment, but held that poor judgment alone doesn’t make an otherwise probable-cause-supported arrest unconstitutional — the case remains the reason officers retain broad discretion to arrest, rather than merely cite, even for genuinely minor offenses.

Example. An officer who personally witnesses a felony assault has probable cause and can make a warrantless arrest on the spot — no need to first obtain a warrant when the crime happens directly in front of them.

Custody plus interrogation, together, trigger the Miranda requirement. A valid waiver of the resulting rights must be knowing, intelligent, and voluntary — not just silence after the warnings are read aloud.

Berkemer v. McCarty, 468 U.S. 420 (1984), addresses a real, common scenario every patrol officer encounters: an ordinary traffic stop. An officer stopped a driver for weaving, suspecting intoxication, and asked him roadside questions without Miranda warnings; the driver made incriminating statements before later being formally arrested and questioned again at the station. The Supreme Court held that an ordinary traffic stop, even though it is technically a Fourth Amendment seizure, doesn’t by itself amount to Miranda custody — it’s typically brief, occurs in public view rather than in a police-dominated setting, and the driver reasonably expects it to be temporary, all of which meaningfully reduce the coercive pressure Miranda is designed to counteract. The roadside questioning was therefore not custodial. But the Court was careful to note that once a stop crosses into a genuine custodial arrest (as it eventually did here at the station), Miranda applies in full from that point forward. The case is the reason routine traffic and field stops don’t automatically require Miranda warnings, while the same encounter can still tip into custody the moment its character genuinely changes.

Example. A detective questioning a formally arrested suspect about the crime itself, in an interview room, is squarely within Miranda’s custody-plus-interrogation trigger — warnings are required before that questioning begins.

The public safety exception (New York v. Quarles) lets narrow, safety-focused questions precede warnings. The routine booking question exception covers administrative processing questions. A truly spontaneous statement, not the product of questioning, generally falls outside Miranda too.

Pennsylvania v. Muniz, 496 U.S. 582 (1990), shows exactly where the routine booking question exception actually ends. A man arrested for driving under the influence was asked, without Miranda warnings, a series of routine processing questions — his name, address, height, weight, and date of birth — all of which the Court agreed fell within the booking exception. But officers also asked him the date of his sixth birthday, a question with no genuine administrative processing purpose at all; it was really a way of testing his mental confusion and slurred speech for evidence of intoxication. The Supreme Court held that this particular question crossed into interrogation, because it called for a testimonial response requiring him to communicate an express or implied assertion of fact or belief, not merely produce routine physical or biographical booking information the exception is designed to cover. The case is the reason officers can’t simply relabel investigative questions as “booking” questions to sidestep Miranda — the exception protects only genuinely routine administrative processing, not any question dressed up to look like one.

Example. “Where’s the gun?” asked immediately after a struggle, before any warnings, can fit the public safety exception if a weapon poses a genuine, immediate danger — a narrow carve-out, not a general excuse to skip warnings.

Once a suspect unambiguously invokes the right to remain silent or the right to counsel, questioning must generally cease — for counsel specifically, until counsel is present or the suspect themselves later reinitiates contact.

Berghuis v. Thompkins, 560 U.S. 370 (2010), shows how demanding the “unambiguous” requirement actually is, and how much it favors continued questioning by default. A suspect, after being read his rights, said nothing to indicate whether he was waiving or invoking them, and remained almost entirely silent through nearly three hours of interrogation, offering only occasional short answers; he never said anything like “I want to remain silent” or otherwise invoked his rights outright. Near the end of the interrogation, he answered “yes” to a pointed question about praying to God for forgiveness for the shooting, which was later used against him. The Supreme Court held that his near-total silence for almost three hours did not itself constitute an invocation of the right to remain silent — a suspect must affirmatively and unambiguously invoke that right, the same way Davis v. United States had already required for the right to counsel, and mere silence, however prolonged, doesn’t meet that bar. The Court then treated his later, voluntary answer as an implicit waiver of the rights he’d never actually invoked. The case remains a real, practical reminder that the burden of clearly invoking these rights falls on the suspect, not on officers to infer an invocation from silence alone.

Example. A suspect says, “I don’t want to talk about this without my lawyer” — questioning about the case should stop at that point, not simply shift to a different topic while continuing.

Distinct from Miranda’s Fifth Amendment basis, the Sixth Amendment right to counsel attaches once formal adversarial judicial proceedings begin (like formal charging or arraignment) and is offense-specific.

Texas v. Cobb, 532 U.S. 162 (2001), confirms just how strictly “offense-specific” is actually enforced, even where two crimes are closely factually connected. A man had been formally charged with, and was represented by counsel on, a burglary charge; while that representation was ongoing, police separately questioned him, without his attorney present, about a related murder that had occurred during the very same burglary, and he confessed. He argued his Sixth Amendment right to counsel on the burglary charge should also cover the closely related murder, since both arose from the same criminal episode. The Supreme Court disagreed, holding that the Sixth Amendment right attaches only to the specific offense actually charged, applying the same Blockburger test used for double jeopardy purposes: two crimes are the “same offense” only if each doesn’t require proof of a fact the other doesn’t. Because burglary and murder each require proving different elements, they were legally separate offenses even though they arose from the same underlying transaction, so questioning him about the murder without counsel present didn’t violate his attached right on the burglary charge. The case is the reason “offense-specific” is a genuinely narrow, technical limitation, not a broader “same overall investigation” standard.

Example. Once someone has been formally charged and arraigned on a specific offense and is represented by counsel, questioning them about that same charged offense implicates this separate, offense-specific right, beyond ordinary Miranda analysis.

Even after a valid Miranda waiver, a confession must separately satisfy the due process voluntariness test — assessed under the totality of the circumstances, including interrogation length and conditions, any coercive tactics, and the suspect’s individual characteristics.

Brown v. Mississippi, 297 U.S. 278 (1936), is the foundational case establishing this due process voluntariness test in the first place, decades before Miranda existed. Three Black defendants in a murder case were subjected to brutal physical torture by law enforcement — including repeated whipping and, for one defendant, being hanged from a tree and then whipped further — until each confessed; the confessions, extracted this way, were the prosecution’s entire case, and all three were convicted and sentenced to death based on them. The Supreme Court reversed, holding for the first time that using a confession extracted through such brutal physical coercion violates the Due Process Clause, regardless of any procedural formality otherwise followed at trial — a conviction “resting solely upon confessions obtained by violence” is fundamentally incompatible with due process of law. The case is the direct ancestor of the modern voluntariness test, and while today’s coercion concerns are rarely this extreme, the same underlying due process principle — that a confession must be the product of a genuinely free choice, not physical or psychological compulsion — traces directly back to it.

Example. A confession following a two-hour interrogation with a denied bathroom request and no breaks could be found involuntary and excluded — even though Miranda warnings were properly given and validly waived at the outset.

After a warrantless arrest, a person is presumptively entitled to a prompt judicial probable cause determination — generally within 48 hours, under County of Riverside v. McLaughlin — before continued detention without independent judicial review.

County of Riverside v. McLaughlin, 500 U.S. 44 (1991), is the case that actually set the 48-hour figure. A class of arrestees challenged the county’s practice of combining probable cause determinations with the arraignment process, which could sometimes delay an arrestee’s first judicial probable cause review for several days, particularly around weekends and holidays. Building on an earlier case, Gerstein v. Pugh, which had already established that a warrantless arrestee is entitled to a prompt judicial determination of probable cause as a precondition to extended pretrial detention, the Supreme Court set a specific, workable benchmark: a probable cause determination provided within 48 hours of arrest is presumptively reasonable, satisfying Gerstein’s prompt-review requirement, while a delay beyond 48 hours shifts the burden to the government to demonstrate a genuine emergency or other extraordinary circumstance justifying the delay. Even within the 48-hour window, though, an arrestee can still challenge an unreasonable delay caused by something other than a genuine emergency, like delay purely for the government’s own convenience. The case remains the standard reference point for exactly how long a warrantless arrestee can be held before a neutral judicial officer must review whether probable cause actually existed.

Example. Someone arrested without a warrant late Friday night is still presumptively entitled to a judicial probable cause review within 48 hours, even across a weekend, absent genuinely extraordinary circumstances justifying delay.