Dunn banned two years for doping
US athlete Debbie Dunn has been banned for two years after testing positive for a banned steroid at the US Olympic trials in June, the US Anti-Doping Agency said on Tuesday.
Dunn was first alerted of a positive test result in July shortly, after the US Olympic Trials in Eugene, Oregon.
The 34-year-old athlete, who didn't qualify to race an individual event in London but had earned a place in the pool of 4x400m relay candidates, withdrew from the US team for London saying she didn't want her case to be a distraction as she awaited the final outcome.
USADA said in a statement on Tuesday that Dunn's positive test for an anabolic agent had been confirmed.
"Dunn, 34, accepted a two-year period of ineligibility, which began on August 1, 2012, the date she accepted a provisional suspension," USADA's statement 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."