Home › Case briefs › Criminal Procedure

Pennsylvania v. Muniz

Supreme Court of the United States · 1990 · Criminal Procedure

Criminal ProcedureFifth AmendmentMirandaSelf-IncriminationMiranda warningscustodial interrogationtestimonial evidencephysical evidence

Facts

After an officer observed signs of intoxication, Muniz drove away despite being told to remain parked, was stopped, failed roadside field sobriety tests, and admitted he had been drinking. At the booking center, police videotaped routine questioning, repeated sobriety tests, and a breathalyzer request before giving Miranda warnings. In response to booking questions, Muniz gave biographical information but stumbled over some answers and said he did not know the date of his sixth birthday. During the sobriety and breathalyzer phases, he made incriminating utterances while trying to follow instructions and discussing the implied-consent law.

Issue

Whether Muniz's pre-Miranda statements and utterances at the booking center were testimonial responses to custodial interrogation and therefore had to be suppressed under the Fifth Amendment. More specifically, the Court considered the sixth-birthday answer, the routine biographical booking answers, and the statements made during sobriety testing and breathalyzer-related questioning.

Rule

The Fifth Amendment protects only compelled testimonial or communicative evidence, not compelled real or physical evidence. A response is testimonial when it explicitly or implicitly conveys a factual assertion or discloses information, including when a suspect is asked a question that forces a choice among truth, falsity, or silence. Under Miranda, custodial interrogation includes express questioning and its functional equivalent, but routine booking questions reasonably related to administrative concerns fall outside Miranda's coverage; similarly, limited instructions and inquiries attendant to legitimate physical sobriety testing or a breathalyzer request are not interrogation when they are not reasonably likely to elicit an incriminating response.

🔒

See the holding & full analysis

Create a free KwikCourt account to unlock the rest of this brief — and practice the case.

The court's holding and reasoning
Doctrine tests, pitfalls & exam hypotheticals
10 practice questions + 4 AI-graded essays on this case

Free sample · practice this case

Test yourself

One of 10 multiple-choice questions for this case. Pick an answer to see why.

In Phoenix, police arrested Nolan Pierce for suspected drunk driving and brought him to a precinct interview room without Miranda warnings. An officer asked Nolan to say, three times, "The streetlight is bright tonight" solely so the camera could capture how clearly he spoke; the prosecution later offered only the recording to show his speech was slurred, not the sentence's content.

Is the recording admissible over Nolan's Fifth Amendment objection?

Explanation. The Fifth Amendment protects compelled testimonial or communicative evidence, not compelled real or physical evidence. Under the majority opinion, the physical manner in which a suspect articulates words, including slurring, is like voice quality or bodily coordination and is nontestimonial. Because the prosecution uses Nolan's utterance only for its physical characteristics rather than its content, Miranda does not bar admission on these facts.