well I'm going to tell you the way I was thinking when my son was using. THIS IS ONLY WHAT MY THINKING WAS AND BY NO MEANS ADVICE.
If I didn't allow my son to live with me when he was using he absolutely would be dead right now because the two times he overdosed he did it at home and I found him before he died. The one time I had to perform CPR until the paramedics got there. I chose the front row seat because I knew if he OD'd after I kicked him out I wouldn't be able to live with myself. He is 6 months clean and sober and going to meetings at least 3 times a week. I won't say it was because of me but he says I helped him to stay high (I was his enabler) and I helped him to get sober (go figure) I didn't have a rebelious son he always did whatever I asked of him so I don't know if that makes a difference.
anyway thats my story
good luck