SANTA ROSA, Calif. — Former Olympic road cycling champion Samuel Sanchez, who returned a positive doping test in August, had his B-sample confirmed Wednesday and was promptly fired by the BMC Racing Team.

Sanchez’s out-of-competition test revealed growth hormone-releasing peptide 2, or GHRP-2, a drug that increases a body’s level of growth hormone. Several cyclists have tested positive for the drug, among them Italian rider Stefano Pirazzi, who was given a four-year ban earlier this week.

The U.S.-based BMC Team said in a statement Wednesday that it was adhering to its zero-tolerance policy toward doping by terminating the Spaniard’s contract “with immediate effect.”

The 39-year-old Sanchez, who had been provisionally suspended, won gold at the 2008 Beijing Games.

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