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Shadow of doubt

No one disputes the need to curb the use of banned substances in athletics. And no one can expect that there will never be mistakes. But, Diana Taurasi's situation being the latest example, nothing undermines the process more than when doubt is raised about testing procedures and the labs that do them.

Updated: February 17, 2011, 7:21 AM ET

This is the kind of week the World Anti-Doping Agency dreads. Two high-profile athletes cleared of anti-doping charges, and both cases leave observers with many questions about the process of drug testing, fairness, accountability and standards.

Tuesday, 2010 Tour de France winner Alberto Contador was ruled not at fault for a positive test for clenbuterol. He was cleared by the Spanish cycling federation, which accepted his explanation that the banned substance got into his system from contaminated ...

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