It would be a huge understatement to claim that the US has a strange obsession with so called prescription narcotics. Sending doctors and patients alike to jail for supposed overuse or over-subscription.
Look, yes, there is a public interest case where someone is known to be selling or allowing others to be selling such medications onto the black market. But in many of these case (most?) that isn't really the case, or at least they have no evidence of that.
So, again, what exactly is it they're trying to accomplish? Why is the victim? Why do they care?
On a related note, I have a family member (in the US) who works in a clinic, the sole purpose of this clinic is to get people with chronic or in some cases even terminal conditions off of narcotic painkillers. These people provably are in pain, but the system in the US is such that they'll kick people off of painkillers who actually need them simply because of some kind of "narcotic painkillers are bad" circular logic which nobody can explain to me.
I'd really like someone to explain to me why the prescription of painkillers isn't a matter best left to patients and doctors in most cases where there is no suggestion of resale or other corruption. It just boggles my mind that the police are getting into people's personal treatment plans and calling their painkillers illegal.