The United States Anti-Doping Agency (USADA) says it wants more flexible rules for athletes who test positive for cannabis after the White House was reported to be seeking a meeting with the World Anti-Doping Agency (WADA) to discuss easing restrictions.The United States Anti-Doping Agency (USADA) says it wants more flexible rules for athletes who test positive for cannabis after the White House was reported to be seeking a meeting with the World Anti-Doping Agency (WADA) to discuss easing restrictions.