I have a friend who works on security systems for jails. There are plenty of areas unrecorded. There is cost for one thing - prisons are large places and reco

I have a friend who works on security systems for jails. There are plenty of areas unrecorded. There is cost for one thing - prisons are large places and recording all of it is expensive. There is also the hardware - all cameras etc are a possible source of bits and pieces that could be made into weapons or other contraband. Hearing the security procedures that goes into taking actual tools into a jail makes your realise how locked down they are - every single item (down to a set of keys) has to be inventoried on the way in, and on the way out. No phones taken in - no exceptions. Bear in mind that staff working on security systems never get in the same space as prisoners - it's not like they're fixing cameras in the cafeteria while the prisoners mill around. As an aside, he is investigating the use of automated drones for doing perimeter patrols. They are good at flying a set pattern with a camera payload. But there are many kinks to work out.