Whether the Fourteenth Amendment protects a person against compulsory self-incrimination by a State.
Holding
Yes. The Fourteenth Amendment makes the Fifth Amendment privilege against self-incrimination enforceable against the States, overruling the contrary premise of Twining v. New Jersey and Adamson v. California.
Reasoning
The Court treated the privilege as a fundamental protection of personal liberty, not merely an evidentiary rule that States could withhold. Its incorporation decisions had increasingly recognized that basic guarantees in the Bill of Rights protect individuals from state as well as federal action when they are fundamental to liberty and justice.
The Court relied especially on its coerced-confession cases. Those cases had come to prohibit States from obtaining convictions through confessions produced by threats, violence, promises, or improper influence. Because a State may not induce self-incrimination through coercion short of physical torture, it follows even more strongly that it may not imprison a person to compel potentially incriminating testimony.
The privilege reflects the accusatorial character of the American criminal-justice system. Government must establish guilt through independently and freely obtained evidence, rather than compelling an accused person to furnish the proof of guilt from his own mouth. The Fourteenth Amendment therefore secures the right to remain silent unless one chooses to speak freely, without punishment for exercising that right.