It's been said that while baseball may be America's favorite past-time, football is its passion. The mentality of the sport is violent by nature, but some players and coaches crossed a fine line that separates fierce competition from thuggery.
The NFL has concluded that the New Orleans Saints have been involved in what's been referred to as "Bounty Hunting," where payoffs were made for inflicting game-ending injuries on other teams' star players.
Just how did the bounty or incentive programs work?
And how prevalent are they in the NFL? CNN's Ed Lavandera investigates.
"Bounty Hunters" is one of four riveting stories you wonâ€™t want to miss this Sunday on CNN Presents at 8:00 pm ET, replaying at 11:00 pm ET and 2:00 am ET.