Outpatient Drug Rehabilitation

Where I can find reliable statistics for the rehabilitation of drug consumption that are specific?
I am researching for a debate medical marijuana and I would try to find the difference in the number of people checking in to rehab clinics (either for placement outpatient care or whether voluntarily or by court order) vs perscription for medicinal marijuana. Please help
If anyone at the controls of marijuana, surprised me. And if they do, they belong in the trash luny anyway.
Drug Rehab
