Any responsible, humane person would have already put them in place.
It's also against the law in most states to beat a dog with a stick or refuse to feed or water your horses.
Fine, let’s seal the border to trade, and Californians can eat $6.00 a dozen eggs and feel good about themselves, and the rest of us can go back to eating $1.20 a dozen eggs and feel guilty - or not. And since Californians don’t like dams or offshore drilling, they can build some pretty high speed electric trains than can’t go anywhere and admire themselves for that, as well.