Powell’s agent Paul Doyle confirmed in an email to Press Association Sport that the former 100 metres world record holder had tested positive for a banned substance.
Powell, 30, has won gold medals in the 4x100m relay at the Olympics and World Championships and held the world record before his compatriot Usain Bolt.
> Ben Johnson (Athletics)
> Marion Jones (Athletics)
> Justin Gatlin (Athletics)
> Lance Armstrong (Cycling)
> Floyd Landis (Cycling)
> Alberto Contador (Cycling)
> Shane Warne (Cricket)
Mumbai Roundup: 9 incidents that took place this week
Photos: Ajay Devgn, Parineeti, Tabu at 'Golmaal Again' trailer launch
Photos: Dipika Pallikal Karthik oozes oomph in bikinis and sarees
Photos: Kareena Kapoor Khan's grand birthday bash
Photos: 'Dangal' girls Sanya Malhotra, Fatima Sana Shaikh's dinner outing