American athlete Dunn hit with two-year ban after positive drug test
23:02 GMT, 11 September 2012
American 400 metres runner Debbie Dunn has accepted a two-year doping ban.
The 34-year-old, who was world indoor champion in 2010, tested positive for an anabolic agent at the US Olympic team trials in June.
She withdrew from the US 4x400m relay team for the Olympics before the Games after returning a positive test for testosterone/epitestosterone.
Punished: Debbie Dunn has been hit with a two-year doping ban
Dunn's suspension began on August 1, 2012, the date she accepted a provisional suspension.
The United States Anti-Doping Agency said: 'As a result of the sanction, Dunn has been disqualified from all competitive results achieved on and subsequent to June 22, 2012, the date the US Olympic team trials began, including forfeiture of any medals, points, and prizes.'