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Does the constitution allow expo facto laws?

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No. 'Ex Post Facto' laws are specifically prohibited by the US Constitution. Explanation:
Ex post facto
Latin for "from a thing done afterward." Ex post facto is most typically used to refer to a law that applies retroactively, thereby criminalizing conduct that was legal when originally performed. Two clauses in the US Constitution prohibit ex post facto laws: Art 1, § 9 and Art. 1 § 10. see, e.g. Collins v. Youngblood 497 US 37 (1990) and California Dep't of Corrections v. Morales 514 US 499 (1995).

http://www.law.cornell.edu/lexicon/ex_post_facto.htm
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What is an ex post facto law?

An ex post facto law is one that is made retroactive to punish anact that wasn't illegal at the time it was committed. For example,if I didn't wear my seatbelt and wearing one

What does the constitutional prohibition against ex post facto laws mean?

An ex post facto law is one that prohibits that which was formerly legal, and reaches back in time to punish that which was already done back when it was legal. It also includ

Why are ex post facto laws prohibited by the Constitution?

This is to stop congress form passing a law against something that has already happened. In order to be convicted of violating a law, the law must be in effect at the time of

What is expos facto?

  Investigations exposfacto: they are those that depart from a situation problem or present knowledge then to investigate possible reasons or associate factors that allow

Did the Constitution authorize judicial review and ex post facto laws?

Judicial review and ex post facto laws fall into two different categories. The Constitution explicitly forbids Congress from passing ex post facto laws (and bills of attaind

Is the Ex post facto laws not prohibited by the Constitution?

The Constitution prohibits congress from passing any Ex post facto laws. The problem comes with laws passed relating to amendments passed after the constitution was ratified.

Where is the ex post facto law in the US Constitution?

I don't think there is an ex post facto in the Constitution. The way it is mostly applied is that, pre-existing conditions must apply. Unless an act is viewed directly by a(n)