McNabb v. United States
The Supreme Court threw out murder confessions from three brothers because federal agents held them for days, questioning them around the clock, without ever bringing them before a judge as federal law required.
Rather than deciding whether the confessions were coerced under the Constitution, the Court used its own supervisory power over federal courts to bar the evidence, establishing that federal judges can exclude evidence gathered through law-enforcement practices Congress has condemned, even without a constitutional violation.
“We hold only that a decent regard for the duty of courts as agencies of justice and custodians of liberty forbids that men should be convicted upon evidence secured under the circumstances revealed here.”
The Court's core rationale for excluding the confessions without reaching the constitutional question.
How it got here: A federal trial court convicted the men of second-degree murder using their statements; the Sixth Circuit affirmed; the Supreme Court agreed to hear the case.
The Case in Depth
What happened
Three young men from a rural Tennessee community, the McNabbs, were suspected of killing a federal alcohol tax officer during a raid on their illegal whiskey operation. After their arrest, federal agents held them for days in a bare detention room, questioning them for hours at a time without a lawyer, relatives, or a judge present, eventually obtaining incriminating statements used to convict them of murder.
The question before the Court
When federal agents held a group of mountain men for days without bringing them before a judge, questioning them nonstop, could their confessions be used to convict them of murder?
The Court's answer
No — the Court ruled the confessions could not be used, but not because they were necessarily coerced. Instead, the Court relied on its supervisory power over federal courts to require exclusion of evidence obtained through prolonged, unlawful detention and nonstop interrogation without ever bringing the men before a judicial officer, as federal law required.
The Court found that federal agents held the men for days, denying them contact with lawyers or family and questioning them almost continuously, in flagrant disregard of the statute requiring prompt presentation before a commissioner or judge. Allowing convictions built on evidence gathered this way would make the courts complicit in disregarding the law Congress had enacted, so the confessions had to be excluded and the convictions reversed.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Federal law enforcement officers now had a concrete incentive to bring arrested suspects before a judicial officer promptly, because evidence gathered during unlawfully prolonged, incommunicado detention could be thrown out of federal court even if no one could prove the confession itself was coerced or unconstitutional.
What changes now
The convictions of Freeman, Raymond, and Benjamin McNabb were reversed because their confessions could not be used against them. The case does not resolve whether the confessions were coerced under the Constitution; instead it establishes a separate basis, rooted in the Court's supervisory power over federal courts, for excluding evidence obtained through unreasonably prolonged pre-arraignment detention and interrogation.
What this does not decide
The Court explicitly left open whether the confessions were involuntary under the Fifth Amendment. Its ruling rests only on federal courts' supervisory power over criminal procedure, not on a constitutional holding, and does not address state courts or state law enforcement practices.
Concurrences and dissents
Dissent — Justice Reed
“I am opposed to broadening the possibilities of defendants escaping punishment by these more rigorous technical requirements in the administration of justice.”Reed's objection to the Court's new supervisory-power rule for excluding confessions.
Justice Reed argued the Court should have decided only whether the confessions were voluntary under existing constitutional doctrine, rather than creating a new evidentiary rule based on delayed arraignment. He objected that this new rule offered a less clear standard than the voluntariness test, that no one had even objected on delay grounds at trial, and that overturning the convictions punished the officers for procedural omissions not shown to have caused coercion.
How the Court got there
The legal reasoning, step by step
- The Court explained that its authority to review federal convictions is broader than its authority to review state convictions: for federal cases the Court can set standards for fair criminal procedure directly, not just enforce the bare constitutional minimum.
- Because of that broader supervisory power, the Court has long created rules of evidence for federal criminal trials beyond what the Constitution strictly requires, guided by considerations of basic fairness rather than just relevance.
- The Court found that Congress had explicitly required arresting officers to bring a suspect before a judicial officer promptly, a safeguard meant to prevent secret, unsupervised interrogation and prevent the kind of coercive 'third degree' tactics the law was designed to stop.
- Applying that principle to the facts, the Court found that federal agents had kept the men in custody for days, denying them contact with anyone and interrogating them almost continuously, without ever bringing them before a judicial officer as required.
- The Court concluded that allowing confessions obtained through this kind of flagrant disregard of the prompt-hearing requirement to support a conviction would make federal courts complicit in the same disregard of the law that Congress had tried to prevent.
- Because the confessions were central to the case against three of the defendants, the Court held they must be excluded, without needing to decide whether the confessions were involuntary under the Fifth Amendment.