The most comprehensive drug testing ever conducted at the world track and field championships has netted two positive doping tests from August's meet in Daegu, South Korea. Portuguese steeplechase runner Sara Moreira and South Korean sprinter Lim Hee-nam both recorded positive tests for the banned stimulant methylhexaneamine, a substance commonly found in nutritional supplements. The International Association of Athletics Federations tested nearly 2,000 athletes at the meet, the most ever at a global championship in track and field. The stepped-up testing was the first step in a major effort to establish a biological passport program in track and field.
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