My daughter has been to rehab 3 x's. The first 30 days. The second 16 days (because she broke her ankle & her H didn't want her in rehab) she went right out & used...first the pain pills then onto her DOC. This last time was because she felt she had reached her bottom, she was there only 13 days because that is all her ins would pay for. Today she has 60+ days clean & sober, has a sponsor, is working her program. I have hope, but it is "her" recovery. My daughter was only allowed a 10m phone call once a week. (in all of the rehab)
I agree your son seems to be looking for a way out. Stick to your beliefs, don't fall for the quacking.
Hugs,
Chris