Valiyev had a positive test for banned trimetazidine in December at the National Championships in St. Petersburg. However, the results of the inspection were published only after it helped Russia to win gold in the Olympic team competition.
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Thanks to a decision by the Russian anti-doping agency, Valiyev avoided suspension, which was opposed by the International Olympic Committee (IOC), the World Anti-Doping Agency (WADA) and the Skating Union, but CAS rejected their appeal.
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