I dont know what to do

Nicola
Ive just found out my so has been taking cocaine again. Think its been going on for a while but ive never been able to prove it untill today.( My so is an ex addict). I got him Help to get clean and he told me that if it wasnt for me getting him help he would be dead now. I had my suspicions when he started seeing alot of his mate lately, i know he does drugs and drinks heavily (supposed to be recovering alcoholic) my so seems to always want go pop round his and spending time with guy.ive asked my so on several occasions if he had and he said no but im sorry i dont believe him anymore. His friend is a bad influence i really dont like him and ive told my so this and he replys he's my best friend he isnt going away. Hes at work right now do i confront him when he phones on his break ? Or i was thinking of meeting him after work and talking to him then away from the kids. After getting him clean first time, and going through tht heartache can our relationship really carry on ? UPDATE ive just rang him turns out he at work but they've put him front of the hr (disoplionry board) for always being off sick. Theyve sacked him. How i meant to confront him now he's been sacked from his job ? Should i confront him in a few days or not mention it at all? Im scared tht if i confront him now he will go completly off the rails and make things worse