http://www.vice.com/news vice news has a good documentary about krokodil
also check out their docu about the colombian drug "devils breath", they blow this powder into the face of random passer by's, turning them into mindless slaves, making them help you rob them, carry their own tv out, and eventually end up a potential overdose death
terrifying stuff
otherwise, vice has a lot of good docus, especially concerning foreign events.