There is literally zero chance that NFL players are clean.....those dudes define roid abuse. People look at Pujols and think he's a monster of a man, but he would be tiny on an NFL team. It's not like football players just know how to work out better.
I really don't care who is juicing. I think most baseball players are, and all football players are. All it really affects is comparing stats to the past, and even that is overblown. The changes in rules to make QBs untouchable has had more of an impact than any possible roid usage could have. As for baseball, I think what roids do for an athlete benefit a pitcher more than a hitter, so STFU about Bonds and McGwire already...