The U.S. Anti-Doping Agency has announced that Tom Zirbel has accepted a two-year suspension for testing positive for a testosterone precursor at the national championships last August.
The 31-year-old Zirbel has also been stripped of results and prizes won in events in which he participated since he provided a urine sample that showed a positive result for DHEA on August 29. Zirbel finished second to Dave Zabriskie for the second consecutive year at the national time trial championship and then went on to finish fourth at the worlds time trial in Switzerland.
According to USADA, Zirbel tested positive for “testosterone or its precursors.” He accepted a provisional suspension on November 17, the date which marks the beginning of his period of ineligibility.
In his blog on Friday, Zirbel wrote that he accepted the sanction in order to “gain a little credibility with USADA” but indicated he still didn’t know how the positive result came about.
“Even when my friends and family know that I am not a cheat, it still hurts to write this and it really hurt to send that fax today,” he wrote.
“Nothing has really changed: I will still continue to have testing done to try and figure out how this all happened in the first place and I still won’t be racing.”