Usain Bolt: Failed drug tests a setback for the sport

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Failed drug tests a setback - Bolt

Sprinting great Usain Bolt admits the recent positive drug tests of his Jamaican team mates have been a "setback" for the sport.

World 200m champion Veronica Campbell-Brown tested positive for a banned diuretic in June, before Asafa Powell was among a group of Jamaican athletes who failed drug tests in recent weeks.

Six-time Olympic champion Bolt stresses that he is "clean" and has been doing "phenomenal things" from a young age.

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