The idea of automatic surveillance as opposed to an operator is almost the same in terms of effectiveness in protecting citizens, except you're able to run multiple instances, at almost no cost (eliminate a live workng, present listener per audio feed), except if you'd like a reviewer reviewing when a flag is said. But even then, they are able to work remotely, on call, and are useful only if algorithm and detection error must be eliminated to instigate appropriate action (eg. alerting first responders as opposed to just collecting data, etc.)
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