US Olympic gold medal-winning cyclist Tyler Hamilton should be suspended for life after testing positive for a banned substance for the second time in his career, according to the World Anti-Doping Agency.
WADA has filed an appeal asking that the eight-year ban imposed on Hamilton by the US Anti-Doping Agency (USADA) be increased, the Court of Arbitration for Sport said.
Hamilton, 38, won Olympic gold in the time trial at the 2004 Athens Games. He announced his retirement in April after acknowledging he had taken an over-the-counter homeopathic anti-depressant.
Hamilton first failed a doping test shortly after the Athens games and was banned for two years.
CAS said in February, Hamilton gave positive results for testosterone in an out-of-competition test.
He was provisionally suspended the following month and agreed to an eight-year ban in June by signing an acceptance of sanction form, CAS said.
Hamilton said in April he had been diagnosed with depression in 2003. The American denied he had been taking steroids to enhance his athletic performance. He said he was desperate at the time and that people who suffer from depresssion would understand his decision.