Yeah, drug problems are a concern with him. That 2-year suspension revealed that at some point, he was definitely doing the harder stuff.
I hope he's clean, because if he is, I'd like to see Ainge take a flier on him. It would seem like his presence would rub off of the rest of the guys... an energy-filled shot blocking guy on the 2nd unit. Imagine how beastly Giddens, Powe, and Anderson would be? No other 2nd unit can match up with that athleticism and straight up passion.