The out-of-competition test was carried out in September in China’s Zhejiang province.

In January, FINA — the international federation charged with the administration of international water sports competitions — cleared him of wrongdoing because testers for International Doping Tests and Management, which conducts the tests, allegedly hadn’t followed proper procedure. Sun’s attorneys said the testers didn’t produce the proper letters and licenses.

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But that, evidently, wasn’t enough of an excuse for WADA.

It isn’t the first time that Sun has found himself caught up in controversy. In 2014, he was banned for three months for taking a prohibited stimulant. At the 2016 Rio Olympics, where Sun won gold, Australian swimmer Mack Horton branded him a “drug cheat.”

Also Wednesday, WADA President Craig Reedie said the agency has been vindicated over its decision to readmit Russia’s anti-doping agency six months ago, according to Reuters. The Russian agency was suspended in 2015 after WADA produced evidence of a state-backed doping program in Russian sports.

The decision by Russia’s anti-doping agency to allow WADA access to its Moscow laboratory was, per Reedie, a “game changer.”