Secondary Doping Tests Clear Marion Jones' Name
Backup test results on Olympic medalist Marion Jones have cleared the sprinter of any wrongdoing, despite testing positive for an endurance-boosting drug in June. A second test for the substance came back negative. Robert Siegel talks with Dr. Gary Wadler, professor of medicine at New York University.
Wadler is a member of the Prohibited Lists and Methods Committee of the World Anti-Doping Agency.
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