Regarding my friend Marc, the lawyer, mentioned above. I wanted to help him.
I thought about David Crosby the musician. He was a massive coke addict. He said in an interview that the only reason he is alive today, is that he got busted in Texas and sentenced to one year in the Texas Pen.

Texas has a dope rehab program. They put the junkie in a solitary cell for the first week, on bread and water. After 7 days, if the junkie is still alive, he is cured!
Crosby said that he went one year without coke, and when he got out he was cured. He still had to have a liver transplant, he had fried his liver on all the coke.

I seriously thought about ratting my buddy out to the narcs, even though it went against the grain of my thinking. If Marc could do a year in the Georgia Pen he might be cured. But then, I figured, his first night in jail he might hang himself and I would be to blame.

Tough call, but I did nothing. And ten years later Marc was another dead junkie.