Wanderlei Silva appeared before the Nevada Athletic Commission in June for evading a random drug test related to his then-scheduled bout with Chael Sonnen at UFC 175 on July 5. He readily admitted evading the test and stated that he had been taking anti-inflammatories and a diuretic at the time he fled from the tester that the NAC had sent to his gym in late May.
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Wanderlei Silva Files Motion to Dismiss; NAC Postpones Hearing for Evading Drug Test – MMA Weekly