Twenty-three Chinese swimmers tested positive for a banned substance ahead of the Tokyo Olympics in 2021 but were allowed to compete after world governing bodies secretly accepted China's findings that they had ingested it unknowingly, The New York Times said Saturday.

The athletes included nearly half of the swimming team that China sent to Japan, with several going on to win medals, including gold, according to the report.

Many are expected to be in contention again at the Paris Olympics this summer.

The newspaper reported that they tested positive for a prescription heart drug that can enhance performance at a domestic meet in late 2020 and the first days of 2021.

But it was determined by Chinese anti-doping authorities that they ingested the substance unwittingly from tainted food and no action against them was warranted.

The Times cited a review of confidential documents and emails, including a report compiled by the Chinese anti-doping agency and submitted to its global counterpart WADA.

It said WADA and swimming's governing body World Aquatics, which at the time was known as FINA, decided not to act due to "a lack of any credible evidence" to challenge China's version of events.

WADA was not immediately available for comment to AFP but told the Times it opted against pursuing the matter further after "consulting scientists and external legal counsel".

"Ultimately, we concluded that there was no concrete basis to challenge the asserted contamination," said WADA's senior director of science and medicine Olivier Rabin.

World Aquatics confirmed to the Times the cases had been reviewed by a doping control board and were subjected to independent expert scrutiny.

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"World Aquatics is confident that these AAFs (adverse analytical findings) were handled diligently and professionally, and in accordance with all applicable anti-doping regulations, including the World Anti-Doping Code," it said.

But the United States Anti-Doping Agency said the swimmers should have been suspended and publicly identified, calling WADA's lack of action "a devastating stab in the back of clean athletes".

The organisation's chief executive Travis T. Tygart claimed he had provided WADA with allegations of doping in Chinese swimming multiple times since 2020.

China's anti-doping authority was not immediately available for comment.

There was no immediate reply from China's swimming association when contacted for comment.

Chinese swimming has a chequered doping history, with a rash of cases throughout the 1990s. Seven Chinese swimmers tested positive for steroids at the 1994 Asian Games in Hiroshima.

In 1998, swimmer Yuan Yuan was banned after Australian customs officers discovered a large stash of human growth hormone in her bags at the World Championships in Perth.

More recently, three-time Olympic champion Sun Yang was banned for doping, ruling him out of the Tokyo Olympics.

Twenty-three Chinese swimmers tested positive for a banned substance ahead of the Tokyo Olympics in 2021 but were allowed to compete after world governing bodies secretly accepted China's findings that they had ingested it unknowingly, The New York Times said Saturday.

Twenty-three Chinese swimmers tested positive for a banned substance ahead of the Tokyo Olympics in 2021 but were allowed to compete after world governing bodies secretly accepted China's findings that they had ingested it unknowingly, The New York Times said Saturday. The athletes included nearly half of the swimming team that China sent to Japan, with several going on to win medals, including gold, according to the report. Many are expected to be in contention again at the Paris Olympics this summer. The newspaper reported that they tested positive for a prescription heart drug that can enhance performance at a domestic meet in late 2020 and the first days of 2021. But it was determined by Chinese anti-doping authorities that they ingested the substance unwittingly from tainted food and no action against them was warranted. The Times cited a review of confidential documents and emails, including a report compiled by the Chinese anti-doping agency and submitted to its global counterpart WADA. It said WADA and swimming's governing body World Aquatics, which at the time was known as FINA, decided not to act due to "a lack of any credible evidence" to challenge China's version of events. WADA was not immediately available for comment to AFP but told the Times it opted against pursuing the matter further after "consulting scientists and external legal counsel". "Ultimately, we concluded that there was no concrete basis to challenge the asserted contamination," said WADA's senior director of science and medicine Olivier Rabin. World Aquatics confirmed to the Times the cases had been reviewed by a doping control board and were subjected to independent expert scrutiny. ALSO READ: IOC chief Bach backs AI to identify talented athletes ‘in every corner of the world’ as Paris Games looms "World Aquatics is confident that these AAFs (adverse analytical findings) were handled diligently and professionally, and in accordance with all applicable anti-doping regulations, including the World Anti-Doping Code," it said. But the United States Anti-Doping Agency said the swimmers should have been suspended and publicly identified, calling WADA's lack of action "a devastating stab in the back of clean athletes". The organisation's chief executive Travis T. Tygart claimed he had provided WADA with allegations of doping in Chinese swimming multiple times since 2020. China's anti-doping authority was not immediately available for comment. There was no immediate reply from China's swimming association when contacted for comment. Chinese swimming has a chequered doping history, with a rash of cases throughout the 1990s. Seven Chinese swimmers tested positive for steroids at the 1994 Asian Games in Hiroshima. In 1998, swimmer Yuan Yuan was banned after Australian customs officers discovered a large stash of human growth hormone in her bags at the World Championships in Perth. More recently, three-time Olympic champion Sun Yang was banned for doping, ruling him out of the Tokyo Olympics.

23 Chinese swimmers competed at Tokyo Games despite failing doping tests – Reports

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23 Chinese swimmers competed at Tokyo Games despite failing doping tests – Reports