The only worry you should have is providing to card holders... But you may "acquire" your medicine from "any source" and not get your card revoked by the AzDHS.
I don't think it is the responsibility of the patient to ask the provider for their card... As the latter post said, it is the person that is providing the medicine that should have all the worry on your shoulders not the qualifying patient.
Just my 2 cents...
Either way... If you have a green card from the AzDHS, you are excepted to acquire your medicine from a State licensed dispensary not from a caregiver or other patients... Reason - WHERE IS THE MEDICINE COMING FROM? Cultivation has ceased to be "legal" under the AMMA (not counting the very very few places in AZ that are outside of the 25 mile prohibition). A caregiver can only acquire medicine (not grow but simply buy for the patient). So the real issue that I would focus on is the provider - are they growing the medicine "in-house" or simply being a middle man? Until a qualifying patient challenges the 25 mile prohibition, acquiring medicine outside of a dispensary is simply too risky and not in the best interest of the patient and their freedom; not to mention the other liberties that are rendered void (arms, driving, so on...) once a patient registers for a registry ID card from the AzDHS and engages in the medical use of marijuana.
On another note - I cannot believe some of the concentrates that are being sold in the dispensaries. The shit is not medicine when it contains butane oil from the manufacturing process. To each his own!