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. ( See ex post facto (see also ex post facto ).)

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An ex post facto law was brought in with great precipitation, for annulling this dividend.

Would any one pretend to say that a State might enact an ex post facto law or pass a bill of attainder?

But the measure we contend for is termed an ex post facto law, and as such, is declared to be unconstitutional.

No ex post facto law, or law impairing the obligation of contracts, shall be passed.

There must be no ex post facto law; which means that there can be no law against crime retrospective in its effect.

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