Duncan v. Louisiana, 391 U.S. 145 (1968) (U.S. Supreme Court)
Duncan v. Louisiana is a cornerstone incorporation decision in which the Supreme Court held that the Sixth Amendment right to a jury trial in criminal cases is a fundamental right applicable to the states through the Fourteenth Amendment.
Does the Sixth Amendment right to a jury trial in criminal cases apply to the states through the Fourteenth Amendment, thereby requiring states to provide jury trials for defendants charged with serious offenses?
The Sixth Amendment right to a jury trial is a fundamental right essential to the American scheme of justice and is incorporated against the states via the Due Process Clause of the Fourteenth Amendment. States must provide jury trials for defendants charged with serious offenses; only petty offenses may be tried without a jury. Seriousness is principally measured by the maximum authorized penalty and the nature of the offense.
Yes. The Sixth Amendment jury-trial right applies to the states through the Fourteenth Amendment. Because the charged offense was punishable by up to two years' imprisonment, it was a serious offense, and Duncan was constitutionally entitled to a jury trial.
Duncan constitutionalized the right to a jury trial in state criminal prosecutions for serious offenses and stands as a landmark in the selective incorporation project of the Warren Court. For law students, it illuminates: (1) the methodology of selective incorporation; (2) the functional, historical, and structural rationales for the jury as a check on state power; and (3) the doctrinal line between serious and petty offenses. Duncan also set the stage for later refinements: Baldwin v. New York (1970) confirmed that offenses with authorized imprisonment exceeding six months are serious; Williams v. Florida (1970) held that a 12-person jury is not constitutionally required; Apodaca v. Oregon (1972) temporarily permitted non-unanimous state juries; and Ramos v. Louisiana (2020) later held that the Sixth Amendment, as incorporated, requires unanimity in state criminal jury verdicts.