...violates due process. Pp. 756-765.
(b) Clark's Mott challenge turns on the application of the presumption of innocence in criminal cases, the presumption of sanity, and the..., Clark intended to kill a law enforcement officer on duty or knew that the victim was such an officer on duty. As applied to mens rea (and every other element), the force of the presumption of innocence is measured by the force of the showing needed to overcome it, which is proof beyond a reasonable doubt that a defendant's state of mind was in fact what the charge states. See In re Winship, 397 U. S. 358, 361-363. P. 766.
(ii) The presumption of sanity dispenses...indicate the kinds of mental differences that overcome the presumption of sanity or capacity and therefore excuse a defendant from customary criminal responsibility, see, e...