To what extent were they retroactively legalized? How difficult did they make registering the births of teens or adults? In the US we like to do things like t

To what extent were they retroactively legalized? How difficult did they make registering the births of teens or adults? In the US we like to do things like throw people in prison for dealing marijuana for 20 years, then legalize it, but keep them in because when they did it it was illegal.