It's fuzzy math unless we get a materials specialist in here to talk about elasticity of the equation as well. What method do they use to check the pressure? If they're putting a needle into the ball through the fill hole then they could be letting air out when they extract the needle as well following the test. This would have to play a role if they're right on the edge.
Also, looks like they're homing in on the scape goat:
Report: Patriots Locker Room Attendant ‘Strong Person Of Interest’ In DeflateGate | New England Patriots | NESN.com
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
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