Not to mention veterinary pathways. My ex GF was volunteering at a vet practice, where they kept no track of their meds, other than "hey boss, we seek to be low on Ketamine, swing past the animal pill shop and get a load of it pls".

Also there are travel pharmacies, which will sell you prescription drugs, so long as you insist you're about to go travelling somewhere remote.

The whole pretence that dangerous drugs are controlled and kept away from people is a pretty thin veneer.