The NFL players' union proposed a play for HGH testing on Thursday that would involve conducting a study of players to accurately reflect the natural level of HGH in their systems.
The union claims that NFL players might have a higher natural level of human growth hormone than the general population. The two sides have not agreed on a testing plan because the union has not agreed with testing procedures approved by the World Anti-Doping Agency, which the league had recommended.
The NFLPA's proposal is "a comprehensive HGH testing program that begins with a population study" of players to establish a test standard "that accurately reflects the population of NFL players."
HGH testing was part of the Collective Bargaining Agreement agreed upon in July, provided that the NFLPA approved the process.
"The proposal is deficient in numerous respects and consisent with the NFLPA's ongoing strategy to delay testing as long as possible," a league spokesman said Thursday, according to The Associated Press.