The anti-doping community and scientists familiar with anti-doping work rejected these arguments. On 30 October 2008, Nature (Vol 455) published a letter to the editor from WADA countering Berry's article. However, there has been at least one case where the development of statistical decision limit used by WADA in HGH use testing was found invalid by the Court of Arbitration for Sport. Sun Yang doping controversy In 2018, Chinese swimmer Sun Yang destroyed samples taken during an anti-doping test. In justification, the Doping Control Officer (DCO) in charge of the testing mission was later criticized by Sun Yang, Chinese media, journalists, and scholars for not following the proper protocols. FINA's Doping Panel cleared Sun of wrongdoings. However, WADA appealed the decision to the Court of Arbitration for Sport. A three-member CAS panel found Sun guilty of refusing to co-operate with sample testers and banned him from competitive swimming until February 2028. However, the CAS's decision has been criticized. On December 22, 2020, the Swiss Federal Tribunal set the CAS award aside due to the bias of the president of the panel, who previously tweeted anti-Chinese racial slurs. It was further found that another arbitrator, Romano Subiotto, has been sitting on a WADA's working group. This ban was subsequently reduced to 4 years and 3 months instead of the 8 years it was previously, meaning Sun would be able to participate in the 2024 Olympics. Whereabouts rule The anti-doping code revised the whereabouts system in place since 2004, under which, , athletes are required to select one hour per day, seven days a week to be available for no-notice drugs tests. This was unsuccessfully challenged at law in 2009 by Sporta, the Belgian sports union, arguing that the system violated article 8 of the European Convention on Human Rights; and by FIFPro, the international umbrella group of football players' unions, basing its case on data protection and employment law. A significant number of sports organizations, governments, athletes, and other individuals and organizations have expressed support for the "whereabouts" requirements. The International Association of Athletics Federations and UK Sport are two of the most vocal supporters of this rule. Both FIFA and UEFA have criticized the system, citing privacy concerns, as has the BCCI. WADA has published a Q&A explaining the rationale for the change. National Football League It was revealed in May 2011 that the American National Football League (NFL), which