This sounds like the MSP are making their own laws ? I'm not surprised, they are continually allowed to do that here in MD.I would argue that there's already a carve-out for holders of a medical marijuana card. Section 13-3313(a)(1) of the Health-General Article of the MD Code provides that a qualifying patient may not be subject to arrest, prosecution, or any civil or administrative penalty . . . or be denied any right or privilege, for the medical use of or possession of medical cannabis."
That seems pretty clear to me that a gun owner cannot be stripped of his or her right to own/possess/use that gun on account of being a card holder, nor can he or she be prohibited from owning/possessing/using a gun that he/she acquired after obtaining a card. I am not familiar with the issue, but I believe that the State Police has taken some position to the effect that they won't approve a 77R unless a patient has relinquished a card for 12 months, but, if that's true, I think that's phooey.