ex post facto law


Also found in: Legal, Wikipedia.
Related to ex post facto law: double jeopardy, writ of habeas corpus

ex post facto law

n.
A law that retroactively makes criminal an act that was not criminal at the time it was done. In the United States, the passage of such laws is forbidden by the Constitution.
References in classic literature ?
No State shall enter into any treaty, alliance, or confederation; grant letters of marque and reprisal; coin money; emit bills of credit; make any thing but gold and silver a legal tender in payment of debts; pass any bill of attainder, ex post facto law, or law impairing the obligation of contracts; or grant any title of nobility.
Bills of attainder, ex post facto laws, and laws impairing the obligation of contracts, are contrary to the first principles of the social compact, and to every principle of sound legislation.
No Bill of Attainder or ex post facto Law shall be passed.
No State shall enter into any Treaty, Alliance, or Confederation; grant Letters of Marque and Reprisal; coin Money; emit Bills of Credit; make any Thing but gold and silver Coin a Tender in Payment of Debts; pass any Bill of Attainder, ex post facto Law, or Law impairing the Obligation of Contracts, or grant any Title of Nobility.
By a limited Constitution, I understand one which contains certain specified exceptions to the legislative authority; such, for instance, as that it shall pass no bills of attainder, no ex post facto laws, and the like.
07 functioned as a rule of witness competency and was therefore not an ex post facto law under the holding of Hopt v.
Hendricks argued that by sending him to a state hospital for the criminally mentally ill as he was about to complete 10 years of a prison sentence for molesting two 13-year-old boys, Kansas had subjected him unconstitutionally to double jeopardy - two punishments for the same offense - and to an ex post facto law, new punishment for a previous crime.
ex post facto law (law passed after the alleged act) and is
201) Because Hendricks committed his crimes prior to the statute's enactment, such application would make the Act an unconstitutional ex post facto law.
Thus, the Court ruled that Plaintiff's pleading withstands Defendants' Motion to Dismiss Count III of the Complaint, alleging an unlawful Ex Post Facto Law.
156) An ex post facto law is a criminal law that has a retroactive effect.