not all drugs would show in a drug test would they? She didn't say what type of med they are accusing them of taking. Videos don't lie, but you can misinterpret, if their back was to the camera and she was pulling meds but then took one of her own meds like a tylenol or something, it can look like it was the pt. med. Or maybe if they put a piece of gum or mint in their mouth while in there? I am sure that could be misinterpreted.
I have meds I have to take in the evenings and on clinicals I am there from 1:30-11:30 so I have to take on my shift. (usually my dinner break is to early) I always go in the break room or bathroom to take though so their are know misinterpretations. I have the Rx's to back me up if their ever was a problem, but I often just put my doses for the evening in my pocket so I wouldn't have the bottles on me at the moment anyway, (although they could check my chart if it came up, it's all electronic and I am seen at the same affiliate).
Anyway, for the OP, if it was something like that, make sure you never do this in front of co workers, but most importantly, never take anything in front of patients, family, or in the med room. That is just misinterpretation waiting to happen and a big mess easily avoided. I guess a 4th semester student in my school got kicked out of the program for taking a Rx in the hallway while she was sitting at the little cove thing on her computer charting. It was mistaken and although she was able to prove later she did have prescription apparently it didn't matter.