The Constitution for the United States of America

Article 1
Section 9 - Paragraph 3

No bill of attainder or ex post facto law shall be passed.

No Bill of Attainder

First, let me state that Bills are not Laws. A Bill of Attainder is an act that permits the consequences of an unlawful act by a person to be used as a punishment for his family and descendants.

or ex post facto Law shall be passed.

An ex post facto law is one that has been passed after the fact. The Legislature cannot pass a law today and charge you with violating that law yesterday.

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