Pharmacies are highly regulated, and often audited. My private Pharmacy gets it every few months. They do not dispense meds with out current Scripts.
They are busier than walmart, krogers, and walgreens. And they KNOW YOU you get personal service.
We were discussing Department of Veterans Affairs pharmacies. Apparently the DEA does not apply the same scrutiny to government run drug distribution as it does to the commercial sector.
http://www.va.gov/oig/52/reports/2005/VAOIG-05-00195-195.pdf