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In the US usa, at least, the concept of ex post facto laws, which is what you have described, are specifically prohibited:
Article I, Section 9, Clause 3: No Bill of Attainder or ex post facto Law shall be passed.
Article I, Section 9, Clause 3:
No Bill of Attainder or ex post facto Law shall be passed.
In the US, at least, the concept of ex post facto laws, which is what you have described, are specifically prohibited:
