Supercross riders like Ryan Villopoto have passed the anti-doping tests taken by the American Motorcyclist Association.
The American Motorcyclist Association (AMA) reports that anti-doping testing was conducted at the San Diego (Feb. 11) and St. Louis (March 3) rounds of the AMA Supercross Championship.
No prohibited substances or their metabolites or markers, or the use of prohibited methods, were found in the tested samples.
AMA Supercross Lites class riders tested in San Diego were Dean Wilson, Matt Moss and Cole Seely. AMA Supercross Lites class riders tested in St. Louis were Ken Roczen, Blake Wharton and Justin Barcia.
AMA Supercross class riders tested in San Diego were James Stewart, Justin Brayton and Ryan Dungey. AMA Supercross class riders tested in St. Louis were Ryan Villopoto, Jake Weimer and Davi Millsaps.