NEW YORK (AP) -- The head of the World Anti-Doping Agency says the NFL Players Association's objections to starting tests for human growth hormone is "not about science" and has "no substance."
Speaking to reporters Thursday at an anti-doping conference hosted at NFL headquarters, WADA director general David Howman adds that the NFLPA's stance could lead one to believe that use of HGH is a problem in pro football.
Howman says: "If you've got nothing to hide, open up."
Told of those comments, NFLPA spokesman George Atallah tells The Associated Press that WADA itself "lacks transparency" and says the union still has legitimate concerns about the tests and appeals process.
Howman is the keynote speaker at "The Doping Decision: Deterring Doping in Sport," a conference organized by the Partnership for Clean Competition.