Sorry to come onto this discussion late, but here's my two cents...

My family member (20 years old) was recently diagnosed bipolar. The first psychiatrist ran lab work (blood and urine) and I saw the report, they tested for many illicit drugs. He hadn't confessed to prior use.

We got a second opinion from another psychiatrist, and she also wanted labs.

My feeling was that these doctors were being thorough, not nosey.

The second psychiatrist said that weed complicates the treatment of bipolar disorder, as it is psychoactive.