The United States http://www.ohword.com/best-essay-written/ cheap custom essay papers Police told The Associated Press that the raids were executed after a tip from the World Anti-Doping Agency. Paul Doyle, the agent for the two sprinters, said they worked in conjunction with WADA on the raid after becoming suspicious that Christopher Xuereb, their newly hired trainer, might have given them supplements laced with a banned substance. Doyle also said that Powell and Simpson were aware of the impending raid, but Xuereb was kept out of the loop.