In Chicago, a government watchdog says Shotspotter alerts have only led to evidence of gun crime in 9 percent of cases.
Experts say ShotSpotter is unreliable and disproportionately calls armed police into Black and brown neighborhoods.
Prosecutors in Chicago are being forced to withdraw evidence generated by the technology, which led to the police killing of 13-year-old Adam Toledo earlier this year.
A Motherboard investigation found that ShotSpotter frequently generates false alerts—and it's deployed almost exclusively in non-white neighborhoods.
After the Danforth mass shooting, Toronto politicians have made moves to curb gun violence. But experts believe many of their proposals will be ineffective.
Rattled by a string of gun violence this year, Toronto just approved ShotSpotter, a US-based audio surveillance system that purports to detect the sound of gunshots.