Some people fool the doctor or doctors into giving them prescriptions, this soon catches up with them when they check to see he is getting supplies from more than one source. There are also desperate people that are not addicted but need the money that fool doctors for supply to sell for profit. Resourcefulness is a trait of addicts. Send him an anonymous not to scare the bejesus out of him.
Some of them are friends with doctors, vets or pharmacists, or doctors themselves.

