532
Opinion of the Court
Justice Chase viewed all ex post facto laws as "manifestly unjust and oppressive." Calder, 3 Dall., at 391. Likewise, Blackstone condemned them as "cruel and unjust," 1 Commentaries on the Laws of England 46 (1765), as did every state constitution with a similar clause, see n. 25, infra. As Justice Washington explained in characterizing "[t]he injustice and tyranny" of ex post facto laws:
"Why did the authors of the constitution turn their attention to this subject, which, at the first blush, would appear to be peculiarly fit to be left to the discretion of those who have the police and good government of the State under their management and control? The only answer to be given is, because laws of this character are oppressive, unjust, and tyrannical; and, as such, are condemned by the universal sentence of civilized man." Ogden v. Saunders, 12 Wheat. 213, 266 (1827).
In short, the Ex Post Facto Clause was designed as "an additional bulwark in favour of the personal security of the subject," Calder, 3 Dall., at 390 (Chase, J.), to protect against "the favorite and most formidable instruments of tyranny," The Federalist No. 84, p. 512 (C. Rossiter ed. 1961) (A. Hamilton), that were "often used to effect the most detestable purposes," Calder, 3 Dall., at 396 (Paterson, J.).
Calder's fourth category addresses this concern precisely. A law reducing the quantum of evidence required to convict an offender is as grossly unfair as, say, retrospectively eliminating an element of the offense, increasing the punishment for an existing offense, or lowering the burden of proof (see infra, at 540-544). In each of these instances, the government subverts the presumption of innocence by reducing the number of elements it must prove to overcome that presumption; by threatening such severe punishment so as to induce a plea to a lesser offense or a lower sentence; or by making it easier to meet the threshold for overcoming the presumption. Reducing the quantum of evidence necessary
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