Jamaican discus thrower Traves Smirkle faces doping probe

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Jamaica's Traves Smikle hurls a discus during qualifications at the London 2012 Olympic Games.

Jamaica's Traves Smikle hurls a discus during qualifications at the London 2012 Olympic Games.

Former 100-meter world-record holder Asafa Powell and Olympic relay gold medalist Sherone Simpson tested positive for the stimulant oxilofrone at the national championships. Discus thrower Allison Randall and another unnamed athlete also had positive tests at the meet.