Leonard's comment comes in the light of the fact that Chinese swimming waded through several drug scandals in the 1990s and as reports revealed, even this year, a 16-year-old swimming prodigy, Li Zhesi, failed a drug test.

it was not a time to be politically incorrect but one cannot ignore genetic doping and the fact that it is very difficult to detect.

"The cheats are always years ahead of the system. Aren't they?"

Ye's last 50 metres was faster than men's champion Ryan Lochte, and that has got people talking. "If you have been around swimming you know when something has been done that just isn't right," said John Leonard, executive director of the World Swimming Coaches' Association.