A Westchester County middle school social studies teacher and former lacrosse coach has a $500 a week crack addiction and a penchant for underage girls, prosecutors say. Gregg Cavaluzzi, who has taught at six schools (some in NYC) over the last decade but was recently dismissed from Pelham Middle School, was caught in a sting by cops posing as 15-year-old girls in online chat rooms. Thinking an undercover cop was a teen, he allegedly texted, "At a motel in Bronx partying you smoke? Can you get down here" and asked what's "one thing you like to do very dirty." Cavaluzzi was busted when he showed up in Elmsford, NY, for the rendezvous and was charged with enticing a minor for sex, which could get him up to life in prison if convicted. A previous student of Cavaluzzi tells CBS2, "[The girls] used to talk about how he was such a pervert and they all found it very disgusting. He might look at different body parts thinking the girls wouldn't notice but everybody noticed." Cavaluzzi denies the charges; his lawyer says his client suffers from depression and cocaine addiction.