I listened to this on the BBC documentary podcast yesterday. It was absolutely heartbreaking to hear the man breakdown at the end. They originally gave this guy an out but only if he becomes a confidential informant and then catches some other drug dealer. The guy, due to his lack of time spent in the drug world, didn't know people so eventually failed to catch anyone else.

Everyone should listen to this on BBC

They also talk to a father whose daughter was recruited to be a confidential informant after being caught with drugs and later was killed when the sting operation she was on went bad.