Let's do a thought experiment: say the speed limit in State X is 60mph. In State Y is it is 70mph.
If you went to State Y and drove at 70mph there, will the police in State X arrest you when you come back because you went over 60mph, even though the claimed "offence" was in a different jurisdiction where it was totally legal?
This whole thing about people having abortions where it is 100% legal (or even just - heaven forbid - tracking menstrual cycles) and then getting into trouble for it in places where abortion is not legal seems really weird. I can't believe it is being discussed in the US - this is like something out of Afghanistan.