Wainwright v. Greenfield

Background

A man arrested for sexual battery in Florida pleaded not guilty by reason of insanity. After his arrest, officers read him Miranda warnings; he repeatedly said he understood and asked to speak to a lawyer, declining to answer questions. At trial the prosecution introduced the officers’ testimony about those colloquies and argued in closing that the defendant’s refusals showed comprehension inconsistent with insanity. A jury convicted him and state courts affirmed; a federal appeals court ordered a new trial, and the Supreme Court reviewed the question.

Reasoning

The Court addressed whether using a person’s post‑Miranda silence as evidence of sanity violates the Due Process Clause under Doyle v. Ohio. The Court explained that Miranda warnings carry an implicit promise that silence will not be used against a suspect, and that breaking that promise is fundamentally unfair. The Court rejected the State’s attempts to distinguish proof of sanity from proof of guilt and rejected arguments that the silence was uniquely probative. The Court held that using post‑Miranda silence to prove sanity breaches the same basic unfairness identified in Doyle and therefore cannot be used in the prosecution’s case in chief.

Real world impact

The ruling means prosecutors may not rely on a defendant’s post‑Miranda silence or his expressed desire for counsel as proof of sanity. Prosecutors may still present neutral behavior or other non‑silence evidence about a defendant’s demeanor, but must avoid using the exercise of Miranda rights to infer mental state. The Court affirmed the appeals court’s decision granting a new trial on this basis.

Dissents or concurrances

Justice Rehnquist, joined by the Chief Justice, concurred in the result but argued requests for counsel differ from silence and complained much testimony was admitted without objection.