Between December 31, 2020, and January 3, 2021, 23 Chinese swimmers tested positive for trimetazidine, a banned medication, during the Shijiazhuang Chinese Long Course Invitational. Twenty-eight positive samples came from 60 urine tests. CHINADA concluded that the results were caused by contamination in the hotel environment, reportedly involving beef noodles, and the cases were not publicly disclosed at the time. Thirteen of the swimmers later competed at the Tokyo Olympics, where athletes including Zhang Yufei and Wang Shun won medals, turning the previously hidden test results into a major international controversy when The New York Times and German broadcaster ARD reported the story in April 2024. Critics such as USADA chief Travis Tygart called the handling a cover-up and argued that trimetazidine does not simply appear in a kitchen, while WADA defended the contamination explanation. WADA said the swimmers had very low and fluctuating concentrations, sometimes testing positive and negative within hours, and that athletes staying in one hotel were affected while teammates in other hotels were not. WADA-appointed investigator Eric Cottier found no favoritism or interference and said the decision not to appeal was reasonable, although his final report acknowledged that CHINADA had not followed some rules and that administrative procedures should be strengthened. World Aquatics also found no wrongdoing, but the controversy triggered calls for independent scrutiny and reportedly prompted an FBI investigation into whether WADA had adequately handled the case.
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