Potential ShotSpotter replacement could rely on cellphones

Our Take

NBC Chicago's Charlie Wojciechowski broke down a story worth watching closely: two and a half years after Mayor Brandon Johnson killed the city's ShotSpotter contract, the proposed replacement reportedly leans on cellphone data rather than microphones bolted to light poles. That's a meaningful shift. ShotSpotter was controversial because it put permanent listening devices in Black and brown neighborhoods with little oversight and a track record of false positives. A system built around cellphone signals doesn't just swap one surveillance tool for another — it potentially expands the data trail to every phone in range of an incident, not just the noise.

This is the same pattern we track with license plate readers: a city cancels one flawed surveillance program, then quietly greenlights a replacement that's less visible but arguably more invasive, because it piggybacks on infrastructure people already carry. Cellphone-based detection means location and possibly device-identifying data get pulled into a policing pipeline, often with vague retention rules and little public input on who can access it later. Chicago residents pushed back on ShotSpotter for years and won that fight; they deserve the same level of scrutiny, hearings, and transparency before city council signs off on whatever comes next.

We'll be watching for the actual vendor, contract terms, and data-sharing rules once they surface. In the meantime, check our map to see what surveillance infrastructure is already running in your area, and hit up take-action resources if you want to push your local council for the same transparency Chicago residents are demanding.