Ex post facto laws

Benjamin v. Bailey Ex post facto laws Cases v. U.S. 

As the court noted in its opinion, the defendant contends that the Federal Firearms Act is unconstitutional because (a) it is an ex post facto law (b) it violates the Second Amendment by infringing the right of the people to... 

I. No State shall enter into any treaty, alliance or confederation, grant letters of marque and reprisal, coin money, emit bills of credit, make any thing but gold and silver a legal tender in payment of debts pass any bill of attainder, ex post facto law, or law impairing the obligation of contracts, or grant any title of nobility [Art. i, sect. 10]. ... 

No Bill of Attainder or ex post facto Law shall be passed. 

Section 10. No State shall enter into any Treaty, Alliance, or Confederation grant Letters of Marque and Reprisal coin Money emit Bills of Credit make any Thing but gold and silver Coin a Tender in Payment of Debts pass any Bill of Attainder, ex post facto Law, or Law impairing the Obligation of Contracts, or grant any Title of Nobility. 

It is therefore to be expected that, once extensive researches are conducted, many SS-men will yet be found in the German Democratic Republic who, while already proven guilty [sic ], could not be arrested in the Federal Republic of Germany or in Austria. 336 This perpetual witch hunt is made possible by revisions of laws which act retroactively to exacerbate the trial situation of any accused - in other words, according to Henkys, the process is based on an ex post facto (retroactive) law that violates human rights.337... 

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