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Canelo Alverez Tests Positive for Banned Substance, Blames Mexican Cows

Canelo Alvarez has admitted he tested positive for a performance enhancing drug -- but he's blaming the dirty test on contaminated cow meat. The boxer was tested in advance of his upcoming May 5 rematch against Gennady Golovkin -- and says results show he had trace levels of Clenbuterol.

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