I think you mean ex post facto, which is latin for "after the fact" I think you mean ex post facto, which is latin for "after the fact"
ex post facto ex post facto
I believe it's "ex post facto."
The legal term for a law that has criminal penalties that effect people prior to the enactment of that law is called an "ex-post facto law". Ex-post facto laws are illegal in most countries and the US Constitution expressly forbids the creation or passage of an ex-post facto law.
ex ante beta
Ex post facto laws are specifically prohibited by the Constitution.
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.
That would be making a law retroactive to a date before the passing of the law. The US Constitution forbids doing it. That would be known as an Ex Post Facto Law and is unconstitutional.
(in the US) Ex Post Facto laws are forbidden by the US Constitution.
none. Section 22. No ex post facto law or bill of attainder shall be enacted.
YES
No. Article I, Section 9, paragraph 3 of the Constitution prohibits Congress from passing ex post facto laws.