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term:
Ex Post Facto Clause
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ex post facto clause n
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often cap E&P&F&C
: the clause in Article I, Section 9 of the U.S. Constitution forbidding Congress from passing any ex post facto laws
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.