But he tested positive for excessive testosterone in 2006 , leading to a four - year ban that prevented him from defending his title in Beijing .
Eight years ago , Gatlin was on top of the sprint world after winning gold in Athens .
Gatlin tested positive for excessive testosterone in 2006 , leading to a four - year ban that prevented Gatlin from defending Gatlin 's title in Beijing .
Eight years ago , Gatlin was on top of the sprint world after winning gold in Athens .