In 2010, Alberto Contador argued his clenbuterol positive was the result of contaminated meat, an assertion that failed to sway the World Anti-Doping Agency (WADA) or the Court of Arbitration for Sport (CAS), mainly because Spanish beef producers don't use the substance. The meat was not organic and, in the US, the FDA allows ranchers to implant their cattle with a wide range of hormones, including testosterone, to promote growth provided the levels of the hormones are "below a safe level" when the cows are slaughtered. Also unfortunately for Compton, the news of the CIR result came five months after she'd given the sample, making it highly unlikely she could provide proof it came from a contaminated supplement or food.Ĭompton told Cyclingnews she suspected some beef she'd had for dinner the night before the doping control was to blame. Unfortunately for Compton, the test determined the source was exogenous. Because both men's and women's bodies make their own testosterone, USADA looked at the Carbon Isotope Ratio (CIR), which would determine if the origin of the hormone was natural or of an external (exogenous) origin.
The unusual peak raised flags on Compton's passport, leading USADA to investigate further.
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