Ex Post Facto
/ˌɛks pɒst ˈfækt.oʊ/
Definitions
- (adj.) Relating to a law or action that applies retroactively, usually to the detriment of a defendant.
Ex post facto laws are prohibited by the U.S. Constitution.
- (n.) A law that retroactively changes the legal consequences of actions committed before the enactment of the law.
The defendant challenged the statute as an ex post facto law.
Related terms
See also
Commentary
Ex post facto primarily describes retroactive criminal legislation; it's crucial to distinguish it from retroactive civil laws, which are generally permissible.
This glossary is for general informational and educational purposes only. Definitions are jurisdiction-agnostic but reflect terminology and concepts primarily drawn from English and American legal traditions. Nothing herein constitutes legal advice or creates a lawyer-client relationship. Users should consult qualified counsel for advice on specific matters or jurisdictions.