Roger Clemens' accuser met for about three hours Thursday with federal prosecutors investigating performance-enhancing drugs in sports. Brian McNamee, the pitcher's former trainer, talked with Assistant U.S. Attorney Matthew Parrella and IRS Special Agent Jeff Novitzky about the events that led up to his phone call last week with the seven-time Cy Young Award winner, a person familiar with the session said. The person spoke on condition of anonymity because he was not authorized to disclose details. The meeting took place at the office of Earl Ward, one of McNamee's lawyers. Parrella and Novitzky, part of the BALCO prosecution team that has indicted Barry Bonds for perjury and obstruction of justice, were in the area for Friday's sentencing of former track star Marion Jones.