IANAL, but unless the hypothetical law legalizing these drugs contains clauses detailed what should happen to them, nothing will change for them. After all, eve

IANAL, but unless the hypothetical law legalizing these drugs contains clauses detailed what should happen to them, nothing will change for them. After all, even if it is decriminalized, what they did was a crime at the time they did it and they have already been sentenced. Without legislation specifically changing that, those sentences were correct at the time and would simply stand as is.