The NFL found out the footballs where not up to regulation stadards because during the game, the Colts' defensive players, felt like the ball being thrown by the Patriots, was lighter than usual. The Colts' "lodged a complaint against the Patriots." What they did during half time was the referees measured the pressure of the footballs again and found that it was inflated 2 pounds of pressure per square inch. The football pressure matters so much because, with less pressure, it is easier to throw and easier to catch, giving the Patriont a higher advantage of winning the game when the ball is easier to catch and throw.