Just last month, Britain's top sprinter Dwain Chambers and several American athletes tested positive for the drug THG.

就在上个月，英国顶级赛跑选手达文？钱伯斯和其他几名美国选手在变体兴奋剂检测中，结果呈阳性。

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Powell timed 9.95 while Richard Thompson of Trinidad (9.98) and Britain's Dwain Chambers (10.04) also qualified.

CNN: Bolt smashes own record to win world 100m title

CAS's verdict opened the door for 100m sprinter Dwain Chambers to compete at his home Games.

CNN: STORY HIGHLIGHTS

Mo Farah and Dwain Chambers were also selected in the 32-strong squad for the event, which starts on 4 March.

BBC: Ennis and Aikines-Aryeetey set for European Indoors