— Relay sprinter Debbie Dunn took her name off the U.S. Olympic team roster Friday after testing positive for excessive testosterone.
Dunn, who finished fourth in the 400 meters at Olympic trials, was selected for the American relay pool. She is the 2010 world indoor champion at 400 meters and would have been a likely candidate to run in the Olympic 1,600-meter relay, which the American women have won every year since 1996.
