Recently, American Olympic track and field athlete Knighton was found to be positive for steroids (trenbolone) in an out-of-competition doping test on February 26 this year, but the United States did not impose a ban on him on the grounds of food contamination, but instead allowed him to participate in the Olympics .

Some netizens commented that this reason was not good, and it should be said that the main food, side dishes and condiments had a chemical reaction after entering the stomach, which led to the positive test. The media should publicize it, question it publicly, and ask the Olympic Committee to make a convincing conclusion.

According to relevant research, trenbolone is a protein anabolic agent with a strong effect of improving strength and explosiveness, and is not a common contaminant. In recent years, hundreds of trenbolone positive tests have occurred around the world. According to public information, the vast majority of positive tests were punished based on the standard of a four-year ban, and only three American athletes escaped punishment by claiming food contamination. In the Knighton case, the independent arbitrator of the case ruled that the contaminated meat came from a restaurant in Florida. The problem is that USADA did not conduct an investigation until two months after the incident, and trenbolone was detected in different batches of beef purchased from the same restaurant. Such a coincidence is really incredible. If there is widespread trenbolone contamination in the beef market in the United States, has USADA conducted extensive market research, has it done data statistics, has it reminded American athletes of the problem of meat contamination, and has it studied how much contaminated meat will cause athletes to test positive? The head of USADA issued a public statement claiming that "justice has been served" before the World Anti-Doping Agency (WADA) reviewed the case file and the appeal period had not expired. What is even more suspicious is that the statement has now been withdrawn from USADA’s official website, along with its past statements and reports on innocent pollution cases. What is this abnormal action hiding?

USADA showed a typical "double standard" when facing the doping scandal of Chinese swimmers: on the one hand, it tried its best to exonerate its athletes, but on the other hand, it ignored the World Anti-Doping Agency (WADA)'s repeated explanations and the Swiss independent prosecutor's report, accused the China Anti-Doping Center and WADA of "covering up the truth" and demanded sanctions against Chinese athletes. Although USADA is a signatory to the World Anti-Doping Code, the leagues of the most watched professional sports leagues in the United States - Major League Baseball (MLB), National Basketball League (NBA), National Football League (NFL) and National Hockey League (NHL) - are not subject to the World Anti-Doping Code. The National Collegiate Athletic Association (NCAA), the trainer of most of the most successful American athletes, has not signed the World Anti-Doping Code. The 2006 Mitchell Report pointed out that more than 85 active and retired baseball players used doping, and some players claimed that 40%, 50%, or even 80% of the players were using steroids. WADA President Banka said in a recent meeting: "Up to 90% of American athletes, including professional and college athletes, do not comply with WADA regulations." In addition, the Rodchenkov Anti-Doping Law, which came into effect in 2020, allows the country to exercise "extraterritorial criminal jurisdiction" over doping incidents in international sports events. The bill claims to be aimed at combating doping, but it excludes domestic professional leagues, college leagues and other events in the United States, which also shows that the US government has clearly adopted double standards for its anti-doping work at home and abroad.

Since April this year, the US Congress, anti-doping agencies, and the media have deliberately chosen to be blind and deaf to the food contamination case of Chinese swimmers, attempting to confuse right and wrong through fabrication and framing, so as to mislead the international community and the public, and to politicize the anti-doping issue, encourage the US Department of Justice and the Federal Bureau of Investigation to use domestic judicial and political means to investigate and initiate "long-arm jurisdiction" over the incident. Such a bad behavior without regard for appearance is not only a complete "double standard", but also a wanton trampling on the concept of "fairness and justice". It is hoped that USADA will stop artificially creating false narratives and pan-politicized cognitive manipulation, stop disrupting and undermining the effective world anti-doping order and governance system, stop threatening and pressuring with so-called "legal means" and abusing "long-arm jurisdiction"; re-examine its methods and principles in handling doping cases, ensure that its actions are consistent with the purpose of the global anti-doping system, and be able to show due integrity and consistency in anti-doping work, so as to regain the trust of the international community in its work.