 Thanks to investigative reporting, it appears that in January 2021, the Chinese anti-doping agency known as Chinada collected 60 samples from Chinese swimmers staying in the same hotel for a national championship swim meet. Nearly six weeks later, in March of 2021, test results were reported to WADA, showing that 23 of the swimmers tested positive for TMZ. Chinada suggested that TMZ positive tests were due to food in a contaminated kitchen that served the athletes.