[millerph]

How could the ball pressure be the same for both teams 2 hours before the game, but 2 pounds diffrent at halftime?

Fill them with 120 degree air just before giving to officials for inspection.

[Fresh Wind]

How could the ball pressure be the same for both teams 2 hours before the game, but 2 pounds diffrent at halftime?

Fill them with 120 degree air just before giving to officials for inspection.

Bingo!