3. Justin Gatlin

Gatlin's drug history started early. In 2001, he was banned from competition for two years after testing positive for amphetamines, but he appealed the decision, claiming that drug showed up in tests because of medication he had been on for attention deficit disorder since he was a kid.

Gatlin won gold in the 100m sprint at the 2004 Summer Olympics, clocking in at 9.85 seconds. He also won bronze in the 200m and silver as a part of the 4x100m relay. In 2005, he won the 100m at the World Championships in Helsinki by the widest margin ever seen at that event. In 2006, he tested positive for performance-enhancing drugs and was sentenced in late 2007 to a four-year ban from athletics.

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