Even wilder: the other day I ran across https://en.wikipedia.org/wiki/Gonzales_v._Raich which apparently held that growing marijuana, for personal use under state law, is also interstate commerce. Is there anything at all that isn't interstate commerce?
I mean, that's basically Wickard v. Filburn 60 years later and with a different plant. It actually seems downright reasonable if you accept Wickard as settled law, which it is.