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Minneapolis has already adopted it. And this past week three more cities from the heartland — Flint, Mich.; Youngstown, Ohio; and Omaha, Neb. — have announced plans to roll it out.

The Youngstown Police Department decided to go very public by posting frank warning signs, such as this one at the Youngstown Elementary School: “If You Fire a Gun, We Will Find You.”

ShotSpotter relies on wide-area acoustic surveillance and GPS technology to triangulate the source of gunshots. Sensors are fixed to buildings and poles to provide coverage over a fixed area. With audio-analysis software, it can identify whether a shooter is stationary or moving — meaning police officers can be equipped with information on the speed and direction of, say, a vehicle from which a shot was fired.

Source: Allison Barrie for Fox News.

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Minneapolis has already adopted it. And this past week three more cities from the heartland…