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Many surveillance cameras do capture sound. It's important in investigations to know what was said during an incident.

There are technologies like ShotSpotter - http://www.shotspotter.com/ - which according to the NYT has enough fidelity to pick up things like "doors slamming, birds chirping, cars on the highway, horns honking." as well as conversations:

http://www.nytimes.com/2012/05/29/us/shots-heard-pinpointed-...




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