That search must recommence after a mutually agreeable candidate withdrew from conducting the study, Smith said at an afternoon news conference outside the union’s offices in downtown Washington.

“We just recently found out . . . the league’s choice to run the population study that we had consented to recently withdrew and said that he wasn’t the right person to get this done,” Smith said. “I’m thrilled that the league has made a decision to move forward with the population study. I’m a little frustrated that their selection has now pulled out so that we have to again re-up and try to get this done.”

read more: HGH testing in NFL no closer to starting because of search for new candidate to lead study - The Insider - The Washington Post