Asafa Powell, other Jamaican athletes deny doping

Updated: 15 July 2013 19:31 IST

Powell and Simpson had tested positive for a stimulant 'oxilofrine' (methylsynephrine), while Randall had returned a positive for Hydrochlorothiazide, which is a diuretic that can be used as a masking agent for the use of other more powerful drugs.

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