Hey I read this great article about the azdhs patient and caregiver database which houses the registry for all card carriers in the state. It goes into how law enforcement use it and how they can and can't obtain certain information. Definitely worth a read there is also a link to download a list of all the accounts which can access the database.
http://blogs.phoenixnewtimes.com/valleyfever/2012/08/arizona_medical-marijuana_card.php
http://blogs.phoenixnewtimes.com/valleyfever/2012/08/arizona_medical-marijuana_card.php