What does self-incrimination mean?

Self-incrimination means being forced to testify or provide evidence against yourself in a criminal matter, and the Fifth Amendment forbids it. The amendment, ratified on December 15, 1791, declares that no person shall be compelled in any criminal case to be a witness against himself. The privilege traces to seventeenth century English common law, particularly the 1637 prosecution of Puritan dissenter John Lilburne in the Star Chamber, where he refused to take the oath ex officio that would have required him to swear to answer truthfully even before knowing the charges.

His resistance helped establish nemo tenetur se ipsum accusare, the principle that no man should be compelled to accuse himself, which colonial assemblies adopted and the framers wrote into the Bill of Rights. The protection applies whenever a person reasonably fears that their answer might be used against them in a criminal prosecution. It covers testimony in court, before grand juries, in congressional hearings, in depositions, in administrative proceedings, and during custodial interrogation by police.

The Supreme Court in Miranda v. Arizona (1966) ruled that a confession obtained without informing suspects of their right to remain silent and right to counsel is inadmissible. The Miranda warning, named for Ernesto Miranda whose 1963 confession was thrown out, is now part of standard police practice across the United States. Other key rulings include Hoffman v. United States (1951), which set the standard for asserting the privilege, Kastigar v. United States (1972), which permits compelled testimony when the witness receives use and derivative use immunity, and Salinas v. Texas (2013), which held that silence not preceded by an explicit invocation of the privilege may be admitted as evidence in some circumstances.

The privilege extends only to testimonial communications, meaning statements that reveal thoughts, beliefs, or knowledge. It does not protect against compelled production of physical evidence such as fingerprints, blood samples, handwriting exemplars, voice samples, or in some circumstances cell phone passcodes that involve only physical acts. Schmerber v. California (1966) allowed compelled blood draws, and Doe v. United States (1988) allowed compelled signatures on consent forms.

The privilege is also personal; corporations and other artificial entities cannot invoke it under Hale v. Henkel (1906), although individual corporate employees retain their personal Fifth Amendment rights. To take the Fifth, a witness simply refuses to answer on grounds that the answer might tend to incriminate. Naturalization candidates should know that this protection means police cannot force a confession, judges cannot compel a defendant to take the witness stand, and silence itself is constitutionally permitted.