and any person who is a current user of a controlled substance in a manner other than as prescribed by a licensed physician.
(thank you Antipitas)
Now, is not a medical Marijuana Card "in a manner prescribed by a licensed physician"?
And, if so, then users with a Med MJ card are therefore, NOT "illegal" users. So, since they are not illegal users, they are not prohibited by law from buying a gun.
This seems clear, but I am probably missing something. Please, enlighten me, if you can.