Sorry to double post.
Shit like this is no fun for anyone. You need to talk to the other people in this kids life, like his parents and get this resolved.
I had a friend that went bonkers in high school and it sounds pretty similar. She did a shit load of drugs that are often associated with the head scene, lsd, weed, molly, dmt, nitrus etc...
She had to be sent away for a minute. 10 years later she is doing okay, married etc.
Some other kids that did not get help are now dead.