States such as Missouri are planning to make it illegal for a citizen of Missouri to go to a different state to get an abortion if Roe is ultimately overturned. It attempts to evade legal challenge by using the same "allow private citizens to sue" legal caveat/enforcement mechanismterms (which some would view as loopholes) that Texas enacted last year.
Ignoring the enforcement mechanism, which some believe has shaky legal ground of its own, what sort of precedent exists currently on a state regulating its citizens conduct while out-of-state?