The IOC said it had issued a warning to the two Chinese cycling medallists who wore badges featuring the head of their country's former leader Mao Zedong at the Tokyo Olympics podium, breaching a rule on political gestures, and that the case was now closed.

Olympics: China athletes warned over Mao badges, case closed - IOC

Chinese athletes regularly failed dope tests after the country returned to the Olympic fold in the early 1980s but there was a concerted effort by the government to crack down on the use of banned substances ahead of the 2008 Beijing Olympics

WADA to investigate claims of doping in China

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Olympics: China athletes warned over Mao badges, case closed - IOC

WADA to investigate claims of doping in China