They probably aren't drug testing every reentrant. But if you come back, commit a crime (car accident, assault, etc) and test positive, you can't say "well, I s

They probably aren't drug testing every reentrant. But if you come back, commit a crime (car accident, assault, etc) and test positive, you can't say "well, I smoked weed when I was in Amsterdam last week". In the US, CANZUK, etc that's a totally valid defense as those nations don't really have extranational laws on the books outside of tax, underage sex and human trafficking related ones. And even those are difficult to trigger, with the prosecution needing to prove that you traveled to another nation specifically to commit those offenses. The other obvious case would be South Korean nationals (especially celebs/influencers) doing drugs and posting it on social media.