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What was the precise PSI of each of the 12 footballs the Patriots’ offense used in the AFC Championship Game? We’ll probably never know.

NFL head of officiating Dean Blandino confirmed today that the NFL didn’t log the exact PSI of each football. According to Blandino, when officials inspect footballs to see if they’re properly inflated, they simply approve them or disapprove them.

In other words, although the Patriots did play with under-inflated footballs, the NFL hasn’t kept detailed records of whether those footballs were slightly under-inflated (which could be the result of a change in temperature) or significantly under-inflated (which would indicate that someone purposely let air out of the footballs).

The NFL will apply a low standard of proof to the Deflategate investigation, which means that the NFL doesn’t necessarily need an air-tight case to conclude that the Patriots broke the rules. But anyone who wants the NFL to get to the bottom of this should want the NFL to be as careful as it possibly can to preserve every piece of evidence it possibly can. And a detailed log of the inflation levels of each football is a piece of evidence the NFL should have.