A Long Island math teacher, who was arrested in July for having sex with a 15-year-old girl in an elementary school parking lot, is being charged with yet another sex crime. Daniel Rothbard, 28, was out on bail for the first alleged statutory rape when he was arrested again yesterday. Police say that two weeks before the parking lot incident, Rothbard allegedly lured a 13-year-old girl and her 14-year-old friend to his house, where he resided with his pregnant wife. Prosecutors tell Newsday the 14-year-old walked in on him having sex with the younger girl. None of the victims were his students; Rothbard met them on MySpace posing as a 17-year-old with the screen name "DJ" or "D to the J." According to CBS2, the house is now empty and for sale, and Rothbard's lawyer says his client is on suicide watch and pleading not guilty. But Nassau County Police Lt. John Allen expects to find more victims, and the Valley Stream school district has barred Rothbard from school property and prohibited him from having any contact with children or their parents. He's currently behind bars in lieu of $600,000 bail, an amount his lawyer called excessive.