Don’t these guards have a drum recorder in which they have to use a key, placed at various areas in the jail, to show they were there on time?
A friend of mine used one of those guarding missile silos in New Mexico, and when a silo blew up, he was able to prove to the FBI he had made his rounds at the proper time.
“Don’t these guards have a drum recorder in which they have to use a key, placed at various areas in the jail, to show they were there on time?”
Those were utterly reliable, built like bank vaults, and basically impossible to hack undetected.
Of course, they have been replaced.