For all practical purposes, No. However, technically speaking, if Congress chose to pass an ex-post-facto law (either by 2/3rd in both houses to overrule Presidential Veto power or even if a President were to sign it) the law would be deemed Unconstitutional by the Supreme Court once challenged - hence the beauty of the checks-and-balances system in the United States. In practical terms it would, however, mean that the law would be in force for a period of time until the case challenging it would reach the Supreme Court for review.
The only way to make an ex-post-facto law actually stick would be, in effect, to amend the Constitution.
The answer is no. Section 9 Clause 3
yes
SORNA passed. so the answer is yes.
SORNA passed. so the answer is yes.
SORNA passed. so the answer is yes.
No. Article I, Section 9, paragraph 3 of the Constitution prohibits Congress from passing ex post facto laws.
yes
passing ex post facto laws
ex post facto laws and Bills of Attainder
false
If Congress passes a law making baggy pants illegal, they can enforce the law on individuals who continue to wear them, even if they wore them before the law was enacted. The law would apply to all individuals once it is officially in effect.
Ex Post Facto law "Congress shall pass no Ex Post Facto law", I believe is how it appears in the constitution. It is latin for after the fact.
(in the US) No. The question is an untrue statement.
Ex post facto :)