Jamaica Asafa Powell Athletics

In this Aug. 4, 2012 file photo, Jamaica’s Asafa Powell competes in a men’s 100-meter heat at the 2012 Summer Olympics in London. Powell has been banned from his sport for 18 months. The 31-year-old sprinter tested positive for the banned stimulant oxilofrone at Jamaica’s national trials last June. (AP Photo/Anja Niedringhaus, File)

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