Oscar Valdez didn't offer much insight into why he tested positive for a banned substance during his new interview with ESPN's Mark Kriegel. In fact, the unbeaten WBC super featherweight champion claimed he doesn't know how Phentermine entered his system before he submitted samples to the Voluntary Anti-Doping Association on August 13. Phentermine, a substance banned by VADA both in and out of competition, was detected in Valdez's "A" and "B" samples.
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