** FILE ** In this Sept. 30, 2000 file photo, the U.S. men's 4x400-meter relay team celebrates after winning the gold medal at the Summer Olympics in Sydney. From left are, Antonio Pettigrew, Calvin Harrison, Michael Johnson and Alvin Harrison. Pettigrew for the first time has admitted taking performance-enhancing drugs. He testified ThursdayMay 22, 2008 during the trial of his former coach Trevor Graham, who is accused of lying to federal authorities investigating doping. Graham has pleaded not guilty. (AP Photo/Thomas Kienzle, File)