Sprinter Tyson Gay's B sample tests positive

Tyson Gay’s B sample has also tested positive.

Former world champion and American sprinter Tyson Gay’s B sample has been confirmed positive for a banned substance.

Gay has also failed more than one test in 2013, also testing positive at the US nationals that were held in June, the U.S. Anti-Doping Agency (USADA) said on Friday.

In a statement to Reuters, USADA chief executive Travis Tygart said: “We can confirm that the ‘B’ sample analysis of a sample collected from Mr. Gay has been completed and that the ‘B’ sample analysis has confirmed the ‘A’ sample findings.”

Tygart also confirmed that an additional sample collected from the American sprinter had shown similar results.

“The results of these tests were expected given Mr. Gay’s acceptance of responsibility for the substances found in his body as soon as he was notified of the ‘A’ sample results,” Tygart added.

Earlier this month, Tyson had revealed that the out-of-competition tests had returned positive, although he did not disclose the nature of the substance.

“I don’t have a sabotage story. I don’t have lies … I basically put my trust in someone and I was let down,” said Gay, who added he had never knowingly taken a performance-enhancing drug.

“I made a mistake,” added the 30-year-old, who is jointly the second fastest 100 metres runner of all-time at 9.69 seconds.