NFL players ratified the new collective bargaining agreement Thursday afternoon, officially ending the lockout after 4 1/2 months. The CBA includes blood testing for human growth hormone testing for the first time, with the goal for it to be implemented by Week 1 of the regular season, a source familiar with the talks told ESPN NFL Insider Adam Schefter. The NFL will be the first major U.S. professional sports league to use blood testing for HGH.