The US Anti-Doping Agency (USADA) on Wednesday called for an independent investigation into the case of 23 Chinese swimmers who failed doping tests ahead of the Tokyo 2021 Olympics. The World Anti-Doping Agency (WADA) published a “frequently asked questions” document outlining its handling of the case on April 29, following wide-ranging outrage after news of the case broke. However, USADA said WASA was “doubling down on half-truths and self-serving rationalizations” in the document. “How much longer must we watch WADA dance around the truth, avoiding all accountability and responsibility?” USA…