Whether the Due Process Clause requires proof beyond a reasonable doubt in criminal prosecutions.
Holding
Yes. Due process protects an accused from conviction unless the government proves beyond a reasonable doubt every fact necessary to constitute the charged crime.
Reasoning
The reasonable-doubt standard is deeply rooted in the common-law tradition and long has been treated as a basic protection in American criminal procedure. Although historical practice alone does not conclusively establish a constitutional rule, the standard reflects a fundamental judgment about fair administration of justice.
The standard gives practical force to the presumption of innocence and reduces the risk that a person will be convicted because of factual error. A criminal defendant faces losses of liberty and the stigma of a criminal conviction; a society that values freedom and reputation should not impose those consequences while a reasonable doubt about guilt remains.
Due process allocates the inevitable risk of factfinding error. Because an erroneous conviction of an innocent person is more serious than an erroneous acquittal of a guilty person, the government must bear the demanding burden of persuading the factfinder beyond a reasonable doubt. The Court therefore made explicit that this constitutional rule applies to every fact necessary to establish criminal guilt.