> Are you sure about 4 million surveillance cameras? Who has the ability
> to review all of that video? Are all of those just run by the police
> or is that a total of all security cameras owned by anyone? This
> figure would mean something like 1 for every 10 people, right?

Probably not a wrong count. Much of it is video surveillance of shopping
centres and the like, and goes to live screens in a control room
somewhere. It may well be recorded, for use as evidence in trials, but
the recordings are not actively watched later apart from the control
room staff monitoring it, live unless being searched for evidence later.
I don't know what the overwrite period would be.
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