Firebrand, tell the doc that you want a med card because long term use of prescription pain killers are bad on the liver, which they are. With weed you also avoid increasing tolerance that always happens with pharma drugs which will necessitate a constant switching of pain drugs subjecting you to adverse side effects. I Know a guy who broke his back falling off a railroad car and he has gone through most of the round robin pain pill circus. Dudes liver is getting crispy.
Most doctors understand this and don't have a problem prescribing meds that do the job regardless of what it is. Also, they can't turn you in if you run into a doc that is totally old school because of the doctor patient info thingy.
Good luck.
By the way, you should have your attorney compare the vid you shot with the vid the news crew and or po-po took, to look for any discrepancies such as missing quantities or even the fact that the weed in the cop shop isn't the same as you had. Idk, seems that the more info your att has the better.