Sprinter Grimes charged

American sprinter Mickey Grimes has been formally charged with his second doping offence.

The IAAF have confirmed that Grimes’ B sample corroborated his positive A test for the banned steroid norandrosterone following out-of-competition testing in May.

It is the second time Grimes has been involved in a doping violation after he was stripped of his gold medals in the 100 metres and 4x400m relay at the Pan American Games in 2003 when he tested positive for stimulant ephedrine.