I just had my first appointment with my psychiatrist which he identified my symptoms as possible ADD and talked about starting me on a trial of a prescription to see if that corrects my symptoms. During the appointment he asked if I had ever used drugs or any prescription medications that were not my own before, to which I replied honestly that I have smoked marijuana before and do on occasion. He then schedules another appointment to prescribe the medication but wants to perform various tests CBC, CMP, TSH, but also a urine drug test.

Is ordering a drug test standard procedure for a psychiatrist appt.?
Since I told the psychiatrist that I have used marijuana im assuming it is not going to somehow become an issue once he gets the results since I had already told him.