501 U.S. 624 (1991)
Schad v. Arizona is a pivotal U.S.
Does the Eighth and Fourteenth Amendments require jury unanimity on a single theory of guilt (either premeditated murder or felony murder) to support a conviction of first-degree murder in a capital sentencing context?
The rule established is that the Due Process Clause does not require jury unanimity on whether the defendant is guilty of either premeditated murder or felony murder, provided the applicable state law adequately supports a verdict of guilt through its legal standards and definitions.
The Supreme Court upheld Schad's conviction, ruling that the Arizona statute allowing a general verdict for first-degree murder, with juror disagreement on specific theories of murder, does not violate the Constitution.
Schad v. Arizona is an essential case for legal scholars interested in the intersection of procedural due process and the Eighth Amendment's mandates in capital cases. It highlights the Court's preference for maintaining flexibility in jury instructions and verdicts, respecting states' rights to determine how criminal culpability is defined under their statutes. This case underscores the balance between preventing arbitrary, capricious jury decisions and maintaining coherent judicial processes consistent with historical practices.