The ex-principal of Teaneck High School, already facing charges that he engaged in sexual conduct and conversation with a student, may face more charges if questionable photos on his computer are child pornography, authorities said. Joseph White, 61, has been charged with official misconduct and endangering the welfare. The charges stem from accusations that he had sexually explicit conversations in May and June of 2006 with a 17-year-old boy in his office, including one incident where White is alleged to have asked the boy to expose himself and to take his pants off in return for a recommendation. In the...