I had to take one rather 2, once when I got my DUI and again when I got arrested and alcohol was involved. I did not have to pee, a counselor asked me questions I answered them honestly,even the ones on MJ. I was under the impression it was to see whether or not I could get into one of their rehab programs, hence assessment. The second time in I poured my guts out about my drinking, I was a hurting pup and all I wanted was some help. The counselor who was a recovered alkie herself, 20 some years, told me I was too young to really be a hardcore case, I was like 31 LOL. She told me AA would help, it didn't I eventually got sober on my own. So here in the Philly area drug assessments are for just that assessing if you need their help getting sober, like I said I did not pee and anything I said was kept between me and the counselor, she really was nice and whatnot but the system is there for one reason...money. The system for drug amd alcohol rehab in the gov't sector is pathetic it's also part of the 11 billion or so a year that goes toward the drug war LOL.
Sorry for the rant but I think all they will care about is whether he brings his check and whether they can milk some more money out of him by ordering him to attend rehab type classes.
And with something this serious I must reitereate that I live near Philly and that is how it is done up here.....so I speak from the heart and my experience and you must take into account that I do not know you friends situation or laws in his area, but I wish him the best.
It's all part of the gov't making their money on drugs and alcohol, you know making money off sick people without really helping them...what's the bigger evil. Once again best of luck to your friend, and tell him if he does have a problem to be honest maybe he can get some help.