I believe the answer is here: https://en.wikipedia.org/wiki/Ex_post_facto_law#Un...

		Jabbles on July 9, 2020 \| parent \| context \| favorite \| on: U.S. Supreme Court deems half of Oklahoma a Native... I believe the answer is here: https://en.wikipedia.org/wiki/Ex_post_facto_law#United_State... Congress is prohibited from passing ex post facto laws by clause 3 of Article I, Section 9 of the United States Constitution.