If state law conflicts with federal law, SCOTUS certainly does have a say!
>I am making an effort to open carry as well as conceal carry and it works. No adult has said anything and all the kids want to see my gun and want to know if I am a cop or FBI agent. (Of course I don’t let them see or touch).
And what if that federal law conflicts with the federal Constitution? I have a particular example regarding state law and state Constitution; my state’s Constitution forbids laws abridging carrying arms for defense, and yet there is a state statute which prohibits firearms on campus.