I agree, as I said earlier I would have thought "date rape" drugs are monitored closely and are a prescription drug.
So any doctor that was regularly prescribing them and or someone asking for them, on a regular basis would be ringing alarm bells.
The drugs in question are obviously extremely strong sedatives, so I would expect them to be on the monitored drugs list.
Only my thoughts, I may be wrong, but it makes sense to me.
The article is actually very poorly written ( by a cadet ). The part that had me in stitches was the reference "bartender of more than 7 years" and university student. As though 7 years somehow legitimized experience and university student to denote whatever that is supposed to denote about whatever it takes more than 7 years at Uni to accomplish. Both completely irrelevant to the article which was just click bait from the start.