William J. Bratton and John J. Miller:
The phone in the San Bernardino case stopped uploading data to the cloud about six weeks before the killings. That suggests there may be information inside the device that was deliberately concealed. That could include the identities of terrorists who influenced or directed the attack; such information, if pursued, could prevent future plots. Or the iPhone might contain nothing of value. It is Apple’s position that we should never know.
The phone could also contain the plans of the Death Star, but since the FBI screwed this up, we might not ever find out if they’re on there.