What is an example of an ex post facto law?
Sophia Koch
Updated on June 21, 2026
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Herein, what is ex post facto law?
ex post facto law. A law that makes illegal an act that was legal when committed, increases the penalties for an infraction after it has been committed, or changes the rules of evidence to make conviction easier. The Constitution prohibits the making of ex post facto law.
Furthermore, what is the meaning of Article 3 Section 22? Article III (Bill of Rights), Section 22 specifically states: "No ex post facto law or bill of attainder shall be enacted." One which alters the legal rules of evidence and receives less testimony than the law required at the time of the commission of the offense in order to convict the accused.
Similarly, you may ask, why is an ex post facto law unfair?
Ex post facto laws are considered unfair in most societies and are prohibited in the United States under Article I, Section 10 of the Constitution. For example, a law that makes parole requirements more restrictive for a certain crime cannot be applied to individuals who committed the crime before the law was enacted.
What is the difference between an ex post facto law and a bill of attainder?
So the differences are that only one of the laws is applied retrospectively, and only one targets a single person or class of people and allows them to be penalised without any due process. But they are both unfair.
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