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Ex post facto
From wikilawschool.net. Wiki Law School does not provide legal advice. For educational purposes only.
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
Currently, SCOTUS has interpreted ex post facto laws as applicable to criminal cases but not civil proceedings (Calder v. Bull (1798)).
