This would be a relevant case for SCOTUS. Being a citizen from another state would render you unfamiliar with another states unusual or specific laws. Also I feel that unless you could have been proven to be knowingly aiding a citizen of that prohibitive state to violate its laws, then you would have to be aquitted of any charges. Thus securing your privelages and immunities. It would be the responsibility of that prohibitive states citizen to REFUSE or not to accept or request that you break a law of that state.
For all that have a concealed carry permit, how to handle it outside of your own state is pretty well known.
And that is don't do it, unless you know for a fact the other state has recripical rights. A license is only granted for the state in which it is issued, period. So have a CCW in Texas and go to California, do not take your CCW with you.
And the same goes for driving. It does not matter if you come from a state where a U turn is legal, or turning right on a rad. Go to a state where it is not legal, expect a ticket. Sure, the "my state allows it" is all well and good, in court. A judge may let you off, but you are still getting a ticket.
Oh, and do you think that the right to drive in one state with a license from another is a right from the Federal Government? Wrong.
That is a result of a series of agreements and legislations passed in the individual states. Back in 1933 the American Association of Motor Vehicle Administrators (AAMVA) pushed legislation to have each state recognize the license from another. There is actually no Federal requirement that they do so, and at any time individual states can actually choose to remove or restrict such licensing.
But the part about CCW holders not knowing that they can not have their concealed weapon in another state? That is idiotic, that is one of the first things they cover in any CCW class. And every CCW license I have ever seen clearly states it is only valid in that state.
And yes, I have myself been a CCW holder. I held mine in Texas, and threw it away when I moved back to California. I knew that state did not recognize it, so no more need for it.
Oh, and if anybody wants to know the reciprocity laws, there are easy to use resources to help you know.
CCW Reciprocity Maps For All US States (2019 Update)