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NFL teams each bring 12 balls to the game and use their own. The balls are inspected two hours and 15 minutes before kickoff, and have to be inflated to between 13.5 and 14.5 pounds per square inch.
According to Mortensen, New England's game balls were inflated to around 11.5 pounds per square inch.
In theory, an underinflated ball would be easier to hold, catch, and throw.
One source told Mortensen that the league is "disappointed ... angry ... distraught."
We still don't know how the balls got deflated, which is the key to all of this.
Bob Kravitz of WTHR reported on Sunday that the team could be fined and have draft picks taken away if they're found to have deflated the balls intentionally.