European 100 metres champion Dwain Chambers's positive test for the designer steroid THG has been confirmed by a second test.
The result of the British sprinter's B test was known this evening and matches that of the positive A test, a source close to the testing process said.
Once UK Athletics receives official notification of the positive B sample, a disciplinary hearing will be set up. If that hearing finds 25-year-old Chambers guilty, he will face a minimum ban of two years and, under the guidelines of the British Olympic Association's anti-drug stance, he would receive a life ban from the Olympics.
Spokesman for world athletics' governing body the IAAF's Nick Davies confirmed that Chambers's B sample had been tested in Los Angeles on Monday, but said the result had not yet been made public.
"No letter has been sent yet from the IAAF to UK Athletics. That will be tomorrow (Friday) morning at the latest," Davies said.
"UK Athletics will wait until they have received official notification of the result from the B sample before issuing any statement."
Chambers admits having taken THG, which was discovered on August 1st in an out-of-competition test in Germany, but says he was unaware of the contents of the supplements he was taking.