Winnie,
Sorry to hear of this news---
I wish I could enlighten you as to what kind of boundries would work with a teenager, haven't been through that end of addiction, so I am kind of at a loss.
I know with my teen son, it is very hard to enforce boundries, because he may sit and refuse to do anything I ask of him. In return -- all I can do is do NOTHING that he asks of me.
In addition, sometimes after school, he might just make a unilateral decision to go to his 'friends' house, and wont answer his phone, (if he's pissed at the rules at home).
Eventually he returns, and it is a complete power struggle.
All I can say, is that I pray for you and him.
YOU are a wonderful person, with a big heart.
In your case - you might HAVE to sit outside the school or whatever, to make sure he does what he must do, (according to your rules of the house). This takes so much work and effort- it shouldn't be this hard.
Hugs to you,
Love,
cess