Retroactive vs. ex post facto law
Defined in 1 dictionary — Case Law
Definitions from Case Law
From 219 U.S. 140 - Kentucky Union Company v. Commonwealth of Kentucky No 22 Eastern Kentucky Coal Lands Corporation · 1911Most cited · 165 citing opinions
Laws of a retroactive nature, imposing taxes or providing remedies for their assessment and collection, and not impairing vested rights, are not forbidden by the Federal Constitution. ... an ex post facto law and a retroactive law are entirely different things.