Some states have a law that says if you are a resident of the state and do something, anywhere, that is illegal in the state, and then return to the state, you have broken the law. I.e. you live in California, travel to Nevada, bang a 17 year old (legal in Nevada) then go back to CA, you can be charged with statutory rape. They would apply the same law to travelling to China, space, or the sea. I'm guessing all states don't have this, but I don't know.
With that being said, you can always just not go back to that same state.
There was an instance in the last year or some where a female broke the law on the ISS and wasn't prosecuted. I can't remember the details, might have been a civil matter.
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