How is an out-of-state-traveler quarantine enforced?

I can see it from their side, though. Before they can self-quarantine for two weeks, they need to accumulate enough supplies for that long.

They can get the supplies delivered.

Newly arrived couple on Kauai arrested for not self-quarantining.

The man was from here on Oahu, but his companion was in from Virginia. They flew to Kauai last week, told officials where they were staying and were in turn told they had to self-quarantine in place for two weeks. The authorities watched them turn the opposite direction from where they were staying when they left the airport, so the police went and pulled them over, then informed them again of the self-quarantine rule. An hour later, they were seen at a grocery store still some ways from their lodging and finally arrested. Out on bail now but are facing up to a $5000 fine and/or a year in jail each. Idiots. Some people just cannot learn.

And after a series of arrests of out-of-staters for not self-quarantining, Hawaii is considering making all visitors wear ankle bracelets to monitor their movements. They’re checking into the legality of it.