An ex post facto law is one that supersedes all other applicable laws.

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An ex post facto law is a law that retroactively changes the legal consequences of actions that were committed before the enactment of the law. It is generally considered unconstitutional because it violates the principle of "fair notice" by punishing people for actions that were not illegal when they were committed. It does not supersede all other applicable laws.

An Ex Post Facto Law Is One That Supersedes All