I think I missed something. How did he hack the other guy's computer? He based his analysis on email headers received in his own computer, and used Google, whois, fb, etc. after that. Right?
He didn't hack this guys computer but he pretty much documents for the world to see that he's hacked other computers.
There's stupid and then there is this article.
Before you ever decide to smoke marijuana, I suggest you consult a lawyer.