Well........at the end it said "Now, despite having fielded apologies from the officer's captain as well as from a Maryland Transportation Authority Police internal affairs captain........"
So clearly this officer was out of line, and acted without legal authority. It is not a crime for a person that doesn't own a gun to not know where some gun might be. And they can say they know, that they don't know, or they can be wrong about what they know.....none of that is a crime. That is why, I assume, that the guy got an apology.
Since 'we' travel all over the country, 'we' probably need to know what to do in each state. Here is a good website, though I just found it and can't vouch for it's veracity.
Do You Have A Duty To Inform When Carrying Concealed? We Look At All 50 States For The Answers – Concealed Nation
And none of that addresses what are the rules for a person who carries but doesn't have a CCW in any state, or one who has a CCW but doesn't carry.
The problem with Maryland (and probably New York, etc) is that if you do have a CCW from any state and you are there, they assume you are packing. If I leave my weapon at home, travel through Maryland and New York on my way to Canada, I'm subject to some policeman's assumption that I have a weapon. But if he thinks that alone is legal Probable Cause to search my truck or trailer, and he does so, I am parking that camper until the court date, and he and I will discuss it openly with the judge.
As an opinion, I have no intentions of either going naked into this bizarre world, nor of visiting places that allow perps to be armed but not me. DW wants desperately to see the Northeast, but since she also has a CCW, I'm going to veto it. We'll have to live vicariously through pictures.
There certainly is a ton of confusion in this big old country about this subject, though.