The Patriots used underinflated footballs on Sunday night. The next question is how did it happen? According to a National Football League letter about the investigation into the controversy that was shared with the Globe, the Patriots were informed that the league’s initial findings indicated that the game balls did not meet specifications. The league inspected each of the Patriots’ 12 game balls twice at halftime, using different pressure gauges, and found footballs that were not properly inflated. According to ESPN, 11 of the 12 game balls were found to be underinflated by about 2 pounds each. The NFL specifications...