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On “Prostitution cases dismissed because cops’ cameras mistakenly recorded audio”
"security cameras outside of stores" would be in public areas, yes? The Lifehacker link you pointed to says "Generally speaking, you have the right to record video in all public spaces without need of consent." Now for the fun part - it can be possible to extract audio from video, by careful processing of the small motions the sound induced in objects in the frame. See link to this video . High-speed camera is best, but at the end they show how a regular consumer-level camera can also be used.