 And how is that possible? Just makes no sense. The World Anti-Doping Agency, known as WADA, now acknowledges its officials secretly reviewed positive drug tests for banned substances involving 23 Chinese swimmers. Those results were never made public. The athletes were allowed to keep competing, some winning gold medals at the last Summer Olympics in Tokyo. Yesterday, WADA officials issued a statement saying the U.S. has opened a criminal investigation into the organization's handling of the case.