Since I'm at about the same level as he, I know what he's going through. 19 and a sophomore, I do volunteer work at the youth prison about 40 min. away. Most of the 15 boys (ages 16 - 19) have attempted murder or murder convictions. All have drug convictions. Even after they get out, they will forever be marked as untrustworthy and dangerous. All I can tell them in trying to motivate them to make something of themselves is that they will always have to prove their worth. They have to work extra hard to show they are no longer druggie thugs but responsible young adults. They will always be marked, and so will their friends who were never caught.
I know so many abusers who never got in trouble with the law, but just because I know them, I will never hire them. Some I am good friends with, but their drug and alcohol abuse keeps me from wanting to hire or even work with them. I plan on starting my own architecture firm and want only the best - intellectually and morally.
Your son is risking a lot for a little fun; hopefully he'll grow out of it. Show him this letter and pray for him.