This is just my opinion, and I am in no way, shape, or form a medical professional, but I would be extremely leery of giving an AD to any bipolar child, but especially to one who is already in legal trouble. I did face this with my own son when he was a couple of years older than your son (he was 16). I thought the psychiatrist was going to rx an AD (my son was originally diagnosis ADD/ODD, then after psychiatric testing he got a diagnosis of dysthymia/ODD). He was already on probation, and any more legal trouble would have meant severe consequences.
At one point, I convinced myself that we should give an AD a trial, if the psychiatrist rx it, but after doing some research about manic reactions to AD's, especially among teens, I decided against it. The price for a bad reaction wasn't worth it, in my opinion. Fortunately our psychiatrist agreed, and he rx Lamictal instead, which has been a godsend for us.
I'm not saying don't trial the AD, but I've heard a lot of stories about bad reactions to AD's (many on this board), and when a kid is already in legal trouble, I think you have to give the decision more consideration than the parent of a child who isn't dealing with the system.
Good luck with your decision, whatever you decide. I know the position you're in isn't an easy one.