The Witness is perfect because it can see everything, and that perception does not stop at the skull. In those rare cases where it is necessary, the Witness can enter the brain of a subject by surgical intervention and read the truth directly from the source. It is the key reason Inspectors exist. The machine can perform the function, but it is not actually alive. It is not appropriate that something dead have governance of something living. In the end, there must be oversight not because the Witness makes mistakes, but because the watcher must itself be watched, and be seen to be watched. The System exists for the people, not the other way around, and in the end it is the people who are empowered—and required—by the machine to take any and all of the hard decisions that arise.