Clenbuterol, the muscle-building drug found in Alberto Contador's urine during the 2010 Tour de France, will remain on the World Anti-Doping Agency's banned substance list for 2012, the organization has announced. WADA not to introduce a minimum threshold for clenbuterol positives, an idea supported by some drug testers, including David Cowan, the director of the anti-doping lab for next year's London Olympics. A minimum threshold would reduce confusion over positive tests that could be attributed to eating tainted beef, as cow farmers sometimes use the drug to grow bigger animals. A drug that will not appear on the list is nicotine, a stimulant, which WADA had previously considered adding. The agency will continue to monitor athletes' nicotine use in competition for a possible future ban.
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