The Feds probably don't recognize STATE issued medical MJ cards since MJ is FEDERALLY illegal.
I know that there used to be a FEDERAL program providing "legal" MJ to a (very) few people for medical conditions like glaucoma, but I heard that this program was terminated for new applicants; perhaps older users were grandfathered.
Disclaimer: What I think the current status is of this program shouldn't be considered reliable info, and I've no ideal what if anything MJ has to do with Vickers.