An ex post facto law[1] is a law that retroactively changes the legal consequences or status of actions that were committed, or relationships that existed, before the enactment of the law.

Courts and commentators at times distinguish between the federal Ex Post Facto Clause and the state Ex Post Facto Clause, but also sometimes use the singular Ex Post Facto Clause …

Dec 5, 2018 · Ex post facto laws are laws that criminalize conduct that was previously legal. These laws can also make punishments that were already in place more severe. For example, …

In a legal context, ex post facto is most typically used to refer to a criminal statute that punishes actions retroactively, thereby criminalizing conduct that was legal when originally performed. …

Mar 24, 2025 · ex post facto law, law that retroactively makes criminal conduct that was not criminal when performed, increases the punishment for crimes already committed, or changes …

The Supreme Court has denied ex post facto challenges to laws that impose legal consequences based not solely on past conduct but rather on an ongoing condition that began in the past. In …

Overview of Ex Post Facto Laws. Historical Background on Ex Post Facto Laws. Retroactivity of Ex Post Facto Laws. Ex Post Facto Law Prohibition Limited to Penal Laws. Increasing …

There are three categories of ex post facto laws: those “which punish [ ] as a crime an act previously committed, which was innocent when done; which make [ ] more burdensome the …

Jan 22, 2025 · Explore the legal concept of ex post facto, its constitutional basis, and its implications in criminal and civil law. Ex post facto laws significantly impact the legal system by …

3 days ago · The meaning of EX POST FACTO LAW is a civil or criminal law with retroactive effect; especially : a law that retroactively alters a defendant's rights especially by criminalizing …