Whether the Fifth Amendment, as applied to the States through the Fourteenth Amendment, permits a prosecutor to comment on a criminal defendant's failure to testify and permits a court to instruct the jury that the silence may support an inference of guilt.
Holding
No. The Fifth Amendment forbids both prosecutorial comment on an accused's silence and judicial instructions that treat the silence as evidence of guilt.
Reasoning
In a federal prosecution, adverse comment on a defendant's failure to testify would have been reversible error under federal statute and precedent. Although those federal decisions rested on statute rather than directly on the Fifth Amendment, the Court treated the statutory rule as reflecting the constitutional protection that a defendant may rely on the presumption of innocence without becoming a witness.
California's practice effectively placed the defendant's silence before the jury as evidence for the State. The prosecutor's argument and the court's approval of it were functionally equivalent to offering evidence and having it admitted. That use of silence conflicts with the Fifth Amendment's rejection of inquisitorial methods of criminal justice.
Adverse comment imposes a penalty for exercising the privilege against self-incrimination. A defendant who remains silent must risk having that choice used to suggest guilt, making the constitutional privilege costly and thereby diminishing its protection.
The Court rejected the argument that a jury would naturally infer guilt from silence even without comment. A jury's unassisted inference is different from an inference affirmatively encouraged and endorsed by the prosecutor and trial judge. Moreover, silence can have innocent explanations, including fear that testifying will expose prior convictions or otherwise prejudice the jury.
Malloy required the same Fifth Amendment standards in state and federal criminal proceedings. Accordingly, the Court held that neither a prosecutor nor a judge may invite the jury to treat a defendant's decision not to testify as evidence of guilt. The conviction was reversed.