Related: David Cliinger photo gallery from 2009

COLORADO SPRINGS, Colo. (VN) — David Clinger was issued a lifetime doping ban by the U.S. Anti-Doping Agency (USADA) on Friday after testing positive during a random test while serving a prior doping ban.

Clinger, 34, tested positive for clenbuterol in a sample collected last June 29 in an out-of-competition test. The Utah-based rrider was nearing the end of what had been a two-year suspension for his first doping violation, a positive result for testosterone and modafinil in a sample collected in June of 2009.

Clinger accepted responsibility for using clenbuterol for performance-enhancing purposes, USADA said. The second violation prompted USADA to issue the lifetime competition ban, which began last Tuesday.