text:  One focus appears to be on the World Anti-Doping Agency, known as WADA, and its handling of repeat positive drug tests by some elite Chinese swimmers. In a statement, a group called World Aquatics that governs international swimming competition said their executive director has been subpoenaed to testify in the case. WADA also issued a statement saying it handled the Chinese drug test properly, accusing U.S. officials of exceeding their authority by claiming criminal jurisdiction over the case. Brian Mann, NPR News.