The World Anti-Doping Agency (WADA) has voiced disappointment that the case of 23 Chinese swimmers who tested positive for a forbidden substance is now being investigated by the United States Department of Justice. A WADA statement late Thursday said the organization was “disappointed to learn that the US Department of Justice is now investigating the 2021 contamination case of 23 swimmers in China. “At this time, WADA has not received any contact or request from US law enforcement.” More than a month ago, a committee of the US House of Representatives called on the Department of Justice and t…