Whether the Sixth Amendment right to trial by an impartial jury requires a unanimous verdict to convict a defendant of a serious offense.
Holding
Yes. The Sixth Amendment requires a unanimous jury verdict for conviction of a serious criminal offense.
Reasoning
The Court read the Sixth Amendment’s reference to a “trial, by an impartial jury” as incorporating the established substance of the common-law jury trial, not merely requiring a body called a jury. At the founding, unanimity was an essential and long-settled feature of a criminal jury trial.
English common law had required unanimity for centuries, and early American practice followed the same rule. Founding-era state constitutions, state-court decisions, and influential nineteenth-century legal treatises all treated unanimity as indispensable to a criminal conviction.
The Court’s own precedents had repeatedly described unanimity as part of the Sixth Amendment jury-trial right. Louisiana’s argument that these statements were dicta did not justify abandoning both that longstanding judicial understanding and the historical meaning of the jury-trial guarantee.
Louisiana’s drafting-history argument was inconclusive. Although the Senate removed an express reference to unanimity from an earlier proposed version of the Amendment, that deletion could mean the requirement was understood to be implicit in the phrase “trial by an impartial jury.” Reading the deletion to eliminate unanimity would also threaten to strip the jury-trial guarantee of its historically established content.
The Court rejected Apodaca’s functionalist method of balancing the perceived costs and benefits of unanimity. Constitutional protections fixed by the people’s adoption of the Sixth Amendment are not invitations for later judges to retain only the features they deem sufficiently useful.