Yes, there's no question federal law has precedence in this area. The best a state can do is pass a law stating state and local authorities are not allowed to

Yes, there's no question federal law has precedence in this area. The best a state can do is pass a law stating state and local authorities are not allowed to cooperate in federal drug cases. Here in California medical dispensaries are legal under state law, but occasionally (quite often, really) the feds will come in and arrest anyone involved.