DETROIT (AP) - The Justice Department is investigating possible misconduct by the lead prosecutor in the nation's first major post-Sept. 11 terrorism trial, according to a published report. U.S. Attorney Jeffrey Collins requested the investigation in November after discovering possible ethical violations involving Assistant U.S. Attorney Richard Convertino, the Detroit Free Press reported Saturday, citing sources it did not name. The allegations include withholding evidence from defense attorneys and trying to convince a court employee to get confidential information about a prisoner, the newspaper said. Convertino said Collins is trying to destroy his reputation and career. "This is so untrue,...