Awwww, that's tough ISO. I was once a rebellious teen, and I guarantee you that any disinterest you show in the hot drug dealer chick is only going to make your son fall more "deeply in love" with her. I don't think it matters if you have proof, suspicion, or a smoking gun. And, like Ann said, finding the proof probably only makes you feel worse. I would just focus on taking care of yourself and hope that your son makes good choices on his own.