Well, There is no way she can test you for drugs without your consent. This is violation of your emotions and the trust that you have on her as your Psychiatrist. You can in fact sue her for this. However, on the other hand, you must understand that she did it for your benefit. And she had no personal motive.
Aicha is wrong. I have a chronic condition, pancreatitis, which requires hospitalization when a flare up occurs. They have to do blood tests to check my pancreas levels and they always do a drug test too. I am usually delirious with pain when admitted, and they have to give me pain meds, so I guess that is why they do it, but they don't ask me and don't tell me, but when I ask for itemized bill "drug test" is on there on the ER charges. So yes, they can and they do.