My Son Is Going To A Substance Abuse Clinic And

My son is going to a substance abuse clinic and getting daily doses of Methadone. He has an ex-girlfriend who is the mother of his son and she is an active addict still, I have guardianship of my grandson, but she keeps dangling the pill use in my sons face and last week he had a bad argument with his current girlfriend and the ex was right there to try to pick up the pieces and got some street methadone for him. I had seen him that day and he looked real messed up but wouldn't tell me what he took. When I went to his house the next morning to get him to go to the clinic I couldn't wake him up. Finally, after half an hour I did. I was told he could died if he took street methadone with this clinical prescribed methadone dose because it has a blocker in it.