retrospective effect

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Related to Ex post facto law: double jeopardy, writ of habeas corpus
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Ex post facto laws, by contrast, are defined not only by their reference to the past, but by criteria having nothing to do either with past or future or the functions of government.
Such a statute would not be an ex post facto law because it would not actually punish the conduct leading to the defendant's original conviction that occurred before the firearm statute's enactment.
For mandatory systems--systems that limit sentencing factors and specify particular punishments based on particular facts--defendants enjoy important rights including the right to a jury, the right to proof beyond a reasonable doubt, the right to notice of potential sentencing aggravators, and the right not to be sentenced based on ex post facto laws.
229) on the other hand, if residency restrictions are considered punishment, many of them would be invalid as ex post facto laws.
455, 462-63 (2001) (arguing framers' historical exposure to ex post facto laws spurred constitutional repudiation).
legislature shall pass any Bill of Attainder or ex post facto Law.
The court cited Article I, Section 9 of the Constitution, where it provides "no ex post facto law shall be passed.
To provide otherwise now would be to create an ex post facto law.
26) The question for the Supreme Court was whether the Connecticut legislation was an ex post facto law and therefore unconstitutional.
20, 2006, is an ex post facto law because the "substantial burden on liberty" that it imposes on sex offenders who must wear the GPS devices renders the statute "punitive in effect.
Constitution states flatly, "No bill of attainder or ex post facto law shall be passed.