Rivera v. Delaware

1976-10-12

Headline: Court dismisses challenge to state law making defendants prove insanity by preponderance, leaving Delaware’s manslaughter conviction and the statute intact while declining to decide the federal question.

Holding: The Supreme Court dismissed the appeal for lack of a substantial federal question, leaving Delaware’s ruling that a defendant must prove insanity by a preponderance of the evidence undisturbed.

Real World Impact:

Leaves Delaware’s rule requiring defendants to prove insanity by preponderance in effect.
Means defendants in Delaware must meet that lower evidence standard to succeed on insanity defenses.
Keeps unresolved the conflict between state insanity rules and recent due-process decisions.

Topics: insanity defense, burden of proof, due process, criminal trials

Summary

Background

A woman convicted of second-degree murder in Delaware appealed after the Delaware Supreme Court struck the murder conviction and entered manslaughter, and upheld a Delaware law that requires a defendant who raises insanity to prove mental illness or defect by a preponderance of the evidence. The Delaware statute and its text were cited at length in the state decision, and the defense challenge asked whether that burden-of-proof rule conflicts with recent Supreme Court decisions about how criminal facts must be proved.

Reasoning

The U.S. Supreme Court issued a summary dismissal, saying the appeal did not present a substantial federal question and therefore denying review. Justice Brennan, joined by Justice Marshall, dissented and argued the case raises a real constitutional question. He explained that past cases (like In re Winship and Mullaney) require the prosecution to prove beyond a reasonable doubt every fact that makes up the crime, and that an accused person’s sanity can be part of those facts under older decisions such as Davis.

Real world impact

Because the Court dismissed the appeal, Delaware’s ruling and its evidence rule for the insanity defense remain in place for now, affecting defendants in that State who raise insanity. The dismissal means the Supreme Court did not resolve the possible conflict among its prior decisions, so the legal tension identified in the dissent remains unresolved and could be raised again in future cases.

Dissents or concurrances

Justice Brennan would have noted probable jurisdiction and set the case for full briefing and oral argument, arguing that Leland may no longer be reconcilable with Winship and Mullaney and that the issue deserves full consideration.