Ex post facto law

Definition and stakes

Portrait of Francis Newton Thorpe Francis Newton Thorpe,  The Essentials of American Constitutional Law

“ Both the States and the United States are forbidden by the Constitution to enact ex post facto laws. The prohibition affects every citizen as securing him from the peril of legislation of the kind forbidden. It is a sweeping limitation of power for his or her benefit, and operates for all citizens of whatever age, condition, or circumstance. An ex post facto law is one that makes an action done before the passing of the law, and which was innocent when done, criminal, and punishes that action ”
Source: Gutenberg

Portrait of Joseph Story Joseph Story,  Commentaries on the Constitution of the United States (1833)

“ The Supreme Court have given the following definition. "An ex post facto law is one, which renders an act punishable in a manner, in which it was not punishable, when it was committed." [32] Such a law may inflict penalties on the person, or may inflict pecuniary penalties, which swell the public treasury. [33] Laws, however, which mitigate the character, or punishment of a crime already committed, may not fall within the prohibition, for they are in favour of the citizen. ”
Source: Wikisource

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