Photo: Annie Tritt/The New York Times/Redux
When a gun crime is committed, several bits of information—including bullet holes, striations on shell casings, and gunpowder residue—can help investigators piece together the details of the incident. Now SST of Mountain View, Calif., has added another: a gunfire alert and analysis service called ShotSpotter, which uses an array of acoustic sensors to pinpoint the location of where the trigger was pulled.
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