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The United States Constitution, Article 1, Section 9, which states: "No Bill of Attainder nor ex post facto Law shall be passed." The "Ex post facto" phrase does protect us from a law being applied to an act which was committed prior to said law coming into existence.

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15y ago
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14y ago

It is known as an Ex Post Facto law.

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Q: What is the law called that protects a person from being punished for something that was not against the law when it was done?
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