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I believe you mean "Ex Post FACTO."

EX POST FACTO - Term used to designate action taken to change the effect given to a set of circumstances. This action relates back to a prior time and places this new effect upon the same set of circumstances existing at that time. Ex post facto laws are prohibited by the U.S. Constitution.

In plain English it means that you can't pass a law AFTER something takes place making that act either legal or illegal. The law must exist first!

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12y ago

What else can I help you with?