Modern security strategies rely on surveillance systems. Whether installed in businesses, homes, or public areas, they bring a presence and an authority often compared to a guard standing watch, and they serve a doubly protective purpose. When surveillance acts as a crime deterrent, it protects by giving potential lawbreakers something to worry about. When it provides evidence post-incident, it protects by using the sometimes banal, sometimes dramatic visual record as a way to get to the bottom of things.
The use of the eye in the sky for crime prevention and forensics serves a double purpose: The same system can deter crime and solve it. Operations security makes use of eyes in the sky too. Businesses use surveillance systems to monitor the doings of their employees, to make sure that what goes on in their absence is aboveboard. Surveillance is used functionally for operational security.
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