An investigation has uncovered that 23 Chinese swimmers tested positive for banned substance trimetazidine in early 2021 yet faced no sanctions.

The Chinese Anti-Doping Agency claimed contaminated food was the source of the positive tests, but no suspensions were implemented prior to the investigation's report.

Despite previous doping scandals involving trimetazidine, WADA did not suspend the athletes, blaming COVID-19 for the inability to hold hearings.

The handling of this case, including the absence of immediate transparency and action, contrasts sharply with other instances such as the suspension of Russian skater Kamila Valieva.

The leniency shown toward the Chinese swimmers by WADA has been criticized by other anti-doping agencies, prompting calls for a more thorough investigation.

The case might lead to legal actions, but a resolution is not expected before the Paris Olympics, with lingering questions about the source of the banned substance.