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There are Tiny Electronic Monitoring Devices in Several US Cities

That You have Probably Never Heard About

November 05, 2013
The Blaze

“ When there’s a gunshot in the nation’s capital, the D.C. police can “hear” it — even if they’re not nearby. At least 300 sound-sensors are placed strategically in the District’s most crime-heavy neighborh ”... (read more here)