Hi Tazwert
Suggestions...
> Find "neutral ground" with ppl who care and respect this person and gently confront him or her about your concerns. No name calling or bringing up past events. Simply state your concerns and concrete evidence of your suspcions.
> Then act accordingly. But don't go in thinking that this person is going to openly admit to doing it. Just secure the meds in a safety deposit box ...etc
Hope this helps!