Ex post facto

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Ex post facto laws are twice explicitly forbidden under the U.S. Constitution.

Article I, § 9 forbids the federal government from passing ex post facto laws.

Article I, § 10, forbids States from passing ex post facto laws.

Types of cases[edit | edit source]

Currently, SCOTUS has interpreted ex post facto laws as applicable to criminal cases but not civil proceedings (Calder v. Bull (1798)).