CLEVELAND, Ohio – Growing national research shows that the gunshot detection system used in Cleveland helps police respond to shootings but does little to reduce crime or improve case outcomes.

A new report by Cleveland State University, released Friday, reviewed 87,000 ShotSpotter alerts, surveyed officers and residents and examined how the technology is used.

The 185-page report found that ShotSpotter reliably detects gunfire and gets officers to scenes minutes earlier, but it does not deter violence, it rarely aids investigations, and it strains already thin police resources.

The results were mirrored in a study by the National Institute of Justice that examined the device’s work in Chicago and Kansas City. The research, by Eric Piza , a professor at Northeastern University, found

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