The AMA conducted anti-doping tests at the San Diego and St. Louis Supercross rounds with all the tests coming back clean, according to the AMA.
No prohibited substances or their metabolites or markers, or the use of prohibited methods, were found in the tested samples, a release from the AMA states.
Those tested in San Diego were AMA Supercross Lites class riders Dean Wilson, Matt Moss and Cole Seely. AMA Supercross Lites class riders tested in St. Louis were Ken Roczen, Blake Wharton and Justin Barcia. The AMA Supercross class riders tested in San Diego were James Stewart, Justin Brayton and Ryan Dungey and the Supercross class riders tested in St. Louis were Ryan Villopoto, Jake Weimer and Davi Millsaps.