States can't choose which Federal laws are obeyed inside their borders or not. If the federal govt. has to enforce federal law in a state, that needs to happe

States can't choose which Federal laws are obeyed inside their borders or not. If the federal govt. has to enforce federal law in a state, that needs to happen, and the state needs to cooperate to the extent laid out by statute & legal precedent. No more, no less. The right answer is to have legislation that squares the federal & state policies at the top. "States Rights" never extended to nullification of Federal law, there was a substantial dispute over this in the 1860s.