Yeah, but there are examples going the other way too, like light bulbs (Feds want LED only, so Texas set up their own factories for incandescents) or marijuana (CA lady growing her own pot for her own use, never to be sold, but the feds won in court calling it interstate commerce) or the speed limit (no reason why Rhode Island should have the same limit as Montana, and each state can set their own rules).

Basically I think states have the right to do their own thing whenever the constitution is quiet (and it's not quiet on immigration or guns) but I'm hoping the feds can guarantee that the state stays honest. CA obviously fails the honesty test, which kills their right to be all self-important about stupid laws.