Looks like the NFL are getting a bit more serious than before with the roids allegations report from Al Jazeera.
Unlike the MLB, the NFL originally didn't want to work together with the USADA (US Anti-doping Agency). Either something changed recently or the NFL didn't like ESPN implying they refused help. Now they are working with the USADA to investigate the roids claims and Peyton Manning as the top target for both agencies.
http://sports.yahoo.com/news/usada-h...3051--nfl.html