Whether the Fifth Amendment barred the prosecution from using Salinas's silence during a voluntary, noncustodial police interview when he did not expressly invoke the privilege against self-incrimination.
Holding
No. Because Salinas did not invoke the Fifth Amendment privilege, the prosecution's use of his silence did not violate the Fifth Amendment.
Reasoning
The plurality began with the general rule that a person seeking the Fifth Amendment's protection must claim the privilege when he relies on it. An express assertion gives the government notice to challenge whether an answer would be incriminating or to offer immunity, and it gives courts a contemporaneous record for assessing the claim. A person cannot ordinarily preserve the privilege merely by remaining silent.
The Court recognized limited exceptions to the invocation requirement. A criminal defendant need not invoke the privilege by taking the stand at his own trial, because he has an absolute constitutional right not to testify. Nor must a witness invoke the privilege when official coercion deprives him of a free choice to answer, deny, or refuse, as in an unwarned custodial interrogation under Miranda or when the government threatens the loss of employment or another benefit.
Neither exception applied here. Salinas voluntarily accompanied officers to the station and was free to leave throughout the interview. Because the questioning was noncustodial and there was no claim that police coercion prevented him from asserting the privilege, he could have told the officers that he was declining to answer on Fifth Amendment grounds.
A suspect's silence, even in response to a question that officers may believe is incriminating, does not itself invoke the privilege. Silence can have many meanings: the person may be thinking, embarrassed, protecting another person, or attempting to devise an explanation. Since Salinas alone knew his reason for not answering, he bore the burden of making a timely claim of privilege.