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Michael Williams spent nearly a year in jail on ShotSpotter-based evidence before a judge tossed the case — fueling scrutiny of the technology's reliability in court.

A MacArthur Justice Center analysis found the vast majority of Chicago ShotSpotter alerts led to no evidence of a gun crime, driving claims it wastes resources and over-polices neighborhoods.

Facing accuracy disputes and community pressure, Chicago — one of ShotSpotter's largest deployments — declined to renew its contract.