Tom Zirbel, runner-up for two consecutive years at the USA Cycling Professional Individual Time Trial Championships in August, confirmed yesterday that his “A” blood sample tested positive for DHEA. DHEA, or exogenous dehydroepiandrosterone, is a multi-functional steroid. “The U.S. pro TT was a major objective of mine this season, but I would never compromise my integrity for any bike race. At this point, I don’t know how this happened, but regardless of the outcome of my ‘B’ sample, I intend to find out with the help of a few accomplished scientists and doctors who have selflessly helped me since I first was notified of the ‘A’ findings,” Zirbel said. Because of this, Zirbel will not was dropped from Garmin-Transitions’ 2010 roster. “Tom has been up front with me about this process from the beginning. However, our anti-doping policy is zero tolerance. Tom alerted us to the situation and as a result he will not be riding for us in 2010. I hope that USADA comes to the correct and fair solution in this, and every, anti-doping case,” said Jonathan Vaughters, CEO of Slipstream Sports.