This weekend some of the world’s fastest runners, including Tyson Gay, Asafa Powell and Sherone Simpson, failed their drug tests, causing shock and disappointment in the world of track and field. Take a look at these runners and others who have tested positive for banned substances. — Natelege Whaley
Tyson Gay was anticipating a 100-meter showdown against Usain Bolt at the World Championships in August. But the American record holder in the event failed a drug test for a banned substance on July 14. Gay won an Olympic silver medal as part of the USA's 4x100 relay team during the 2012 summer Olympics. "I don't have a sabotage story... I basically put my trust in someone and was let down," he said of the positive test.