I think its been going on for a few years. After high school, we travelled for a while in Asia where I think he tried it for the first time. I didn't know anything for sure until recently, when he dropped a small bag of white powder in front of my parents (he didn't notice, came back and searched frantically, then denied when confronted with it). After the confrontation, he was awol for 4 days. He just got back this morning.
He's 24 and lives at home. He's been having money problems due to a crazy ex-girlfriend (and due to this, maybe) since he got back from travelling, so he's been forced to live at home. I'm 28 and I live away. We've never had an issue like this, so I'd like some advice on how to handle it.
I don't know much about his situation. I don't know if he's using or selling or both. I know he's hanging with one guy who has a reputation for selling. I know that a while back, I dragged him to a party hosted by my friends where he got so "drunk" that he passed out on the street and was robbed. He claimed that someone had spiked his drink, but I knew most people at that party - most of whom were from the local MtG-community. Anyway. I digress.
If he's confronted with, well, any of his recent bad life decisions, he gets mad and somewhat destructive, then immediately leaves.