Chinese swimmers’ doping claims: what drug was involved, what has been said and what happens next

Reports that 23 Chinese swimmers had failed drug testing weeks before the Tokyo Olympics in 2021, and were allowed to compete anyway, have sparked a major row within the sport. The World Anti-Doping Agency (Wada) said it was aware of the incident and accepted China’s explanation that the tests had been contaminated. But anti-doping officials in the United States have accused Wada of a cover-up.