Your son is exactly where he wants to be right now. My 31 year old AD has maintained a social circle of like-minded people in order for her to stay in denial and in her addictions.
She's been in jail numerous times, went to rehab where she was kicked out for non-participation (she thought it should be a bed and breakfast), lost custody of her children, now has a felony record, and she'll be the first to tell you she doesn't have a problem.
I've placed her squarely in God's hands and gone about the business of living my own life.