Justin Gatlin
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Justin Gatlin (born February 10, 1982) is an American sprinter who specializes in the 100 and 200 metres events. He is the 2017 100m World Champion. He is the 2004 Olympic champion in the 100 metres, the 2005 and 2017 World champion in the same event, and the 2005 World champion in the 200 metres. Gatlin was banned from competing between 2006 and 2010 by the USADA for failing a second drugs test, testing positive for testosterone.

A five-time Olympic medalist, Justin Gatlin's personal best of 9.74 seconds ranks fifth on the all-time list of male 100-metre athletes. He is a two-time 100m World Champion and a two-time indoor world champion in the 60-metre dash in 2003 and 2012, and won both the 100 metres and, 200 metres at the 2005 World Championships.

In 2001, Gatlin incurred a two-year ban from athletics for testing positive for a banned substance; this ban was then later reduced to one year because of an appeal. In 2006, he incurred a further four-year ban (originally an eight-year ban) from track and field for testing positive for a banned substance, with this sanction erasing his then-world-record time of 9.77 seconds in the 100 metres. Gatlin began competing again in August 2010, soon after his eligibility was reinstated. In June 2012 at the US Olympic trials, Gatlin ran a time of 9.80 seconds, which was the fastest-ever time recorded for a man over the age of 30. His continued elite-level career after serving bans for two doping offences made him a controversial figure in the sport.