There are a bunch of rules - mostly protecting QBs from high and low hits and protecting receivers from contact and vicious hits. http://www.realclearlife.com/

There are a bunch of rules - mostly protecting QBs from high and low hits and protecting receivers from contact and vicious hits. http://www.realclearlife.com/sports/nfl-rule-changes-created-golden-era-quarterback-stats/ http://www.realclearlife.com/sports/nfl-rule-changes-created... https://www.foxsports.com/nfl/story/cam-newton-tom-brady-show-nfl-passing-game-explosion-thanks-to-rule-changes-coaching-athletes-091611 https://www.foxsports.com/nfl/story/cam-newton-tom-brady-sho...