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Adwoa Agyepong of the Chicago Democratic Socialists of America speaks at a rally to end the city’s use of ShotSpotter technology on Thursday, Aug. 19, 2021. (WTTW News)

Fewer than 1 in 10 ShotSpotter alerts between 2020 and 2021 resulted in evidence of a gun-related criminal offense being found, according to a new report from Chicago’s independent watchdog.

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(WTTW News)

A new study by Northwestern University’s MacArthur Justice Center found that 86% of ShotSpotter alerts resulted in no report of any crime, leading to questions of the gunfire detection system’s value in violence reduction.