“In RL, if you want to find out which/what drugs, then you take a certain amount, approximately your typical dose of such drug, and perform chemical tests upon it. Once these processes are complete... you won't be wanting to take said drugs - or medication - for the original intended purposes, I guarantee you.
... Being a Medical Student (Pharmacology at that) thats not how you would test a drug. Unless you want to end up in a potential coma from drug misuse (I'm not sure what drugs you're talking of, so my comment was towards the harder stuff :P)
We (the Doctors) have equipment to test the drugs. We grind them with a mortar/pestle and then do several tests to check the authenticity of the drug.
Now. SWC wise... should we have such a method? probably, but its not fully needed. But the way it is, just buy from those you trust.
I personally ONLY sell it as ryll. Not as BACTA.
"Whenever feasible, one should always eat the rude."