CNN —A dispute over the handling of a 2021 case in which 23 Chinese swimmers tested positive for a banned performance-enhancing substance ahead of the Tokyo Olympics now threatens to overshadow swimming events at the Paris Games this summer. Sun is now free to return to competitions next month, but revelations about the 2021 case have cast Chinese swimmers and WADA in a harsh spotlight. Trimetazidine has the potential to boost endurance and has been banned by WADA since 2014. China’s national swimming championships, which serve as selection trials for the upcoming Olympics, are currently underway in Shenzhen, concluding on April 27. At the Tokyo Olympics, China won six medals in swimming, including three golds.

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Persons: –, “, ” Mack Horton, Horton, Sun Yang, Sun, WADA, Adam Peaty, ”, Sarah Hirshland, Witold Banka, …, Trimetazidine, CHINADA, Ross Wenzel, trimetazidine, ” Wenzel, Denis Cotterell, Cotterell wasn’t Organizations: CNN, Tokyo, Paris Games, New York Times, ARD, Doping Agency, Olympic, “, Sydney Morning Herald, WADA, Canadian Olympic Committee, Paralympic, ”, CHINADA, Xinhua, Paris Olympics, Chinese Swimming Association, China Locations: Tokyo, China, Australian, South Korea, ”, trimetazidine, Shenzhen