Interstate commerce has been redefined to mean both way less and way more than the phrase might seem to imply. States can for example introduce rules on emissions when no cars are manufactured in that state.
unless it involves abortions, then it's whatever the Republican parties want to punish women. Or minorities. or black people.
Infact, rules only matter when we're talking about people we dont like.
Not really. The only reason California was able to do this is because it got waivers for the federal law preemption rule (in the Clean Air Act).