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Boxing star Oscar Valdez tests positive for banned substance days before world title bout
Daily Star's biggest headlines straight to your inbox!Oscar Valdez's super featherweight world title defence against Robson Conceicao is in doubt after the defending champion tested positive for a banned substance.The Mexican boxer tested positive for phentermine, a stimulant banned by the Voluntary Anti-Doping Association.Phentermine gives the body strength and endurance, meaning an athlete would be able to work harder and longer until exhaustion in both training and in competition. According to ESPN, a letter written by Pat English, a lawyer for Valdez, claims: "Mr.