Whether the Due Process Clause permits a prosecutor to impeach a defendant's exculpatory trial testimony by questioning the defendant about post-arrest silence after Miranda warnings have been given.
Holding
No. Using a defendant's post-arrest, post-Miranda silence to impeach the defendant's trial explanation violates the Due Process Clause of the Fourteenth Amendment.
Reasoning
Miranda warnings tell an arrested person that he has a right to remain silent, that anything he says may be used against him, and that he may have counsel before questioning. Silence after those warnings may therefore be nothing more than the exercise of the rights the State was constitutionally required to describe.
Post-arrest silence after Miranda warnings is inherently ambiguous. A person may remain silent because he is relying on the warning, because he is afraid, because he is confused, because he wishes to consult counsel, or for other reasons unrelated to whether a later exculpatory account is true. The Court therefore rejected the premise that silence reliably shows that a trial story was recently fabricated.
Although Miranda does not expressly promise that silence will carry no penalty, that assurance is implicit in the warnings. It is fundamentally unfair for the State first to advise an arrestee that he may remain silent and then to invite the jury to treat that same silence as evidence undermining his credibility.
The State's interest in vigorous cross-examination and in exposing fabricated defenses did not overcome this fairness problem. The Court distinguished cases allowing impeachment with statements obtained in violation of Miranda rules: those cases involved prior statements, whereas these cases involved penalizing silence after an official assurance of the right to remain silent.
The Court noted a narrow limitation to its rule. Post-arrest silence may be used to contradict a defendant who testifies that he gave police the same exculpatory account upon arrest. In that circumstance, the silence contradicts the defendant's claim about what he did after arrest, rather than impeaching the substance of his exculpatory story merely because he invoked silence.