The future of testing for human growth hormone is shaping up to be a contentious issue in negotiations between the NFL and the players' union. Kevin Mawae, the president of the NFL Players Association, told The Associated Press on Sunday that the union is aware of developing tests, one of which is a blood test that could detect HGH for up to 14 days. But he said the union believes the test that is currently available, which has only about a 48-hour window of detection, "is not completely reliable." "The testing of HGH is a CBA [collective bargaining agreement] issue that has been discussed on a number of different occasions," Mawae said. "The PA and the players of the NFL will always be in favor of fair and competitive play without the use of performance-enhancing drugs."