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On February 28, 2020, the Court of Arbitration for Sport (CAS) imposed an eight-year ban on Chinese swimmer Sun Yang for violating anti-doping rules. The ban stemmed from an incident in September 2018, where Sun refused to cooperate with sample collectors and allegedly smashed a blood vial with a hammer. The CAS ruling upheld the decision of the World Anti-Doping Agency (WADA) that Sun had committed multiple anti-doping rule violations.