Chicago Police Department
Chicago contracted for an area acoustic gunshot-surveillance system and the Chicago OIG published a detailed analysis of CPD's use. Chicago ended the deployment in 2024.
PROVIDER / PLATFORM
SoundThinking / ShotSpotter
Acoustic gunshot-detection and public-safety technology; formerly known corporately as ShotSpotter.
Vendor capability describes the provider’s published product features. Illinois deployment is listed only when supported by Illinois records or a clearly labeled secondary source.
ILLINOIS CONNECTION
Documented Illinois relationships
Illinois State Police
Illinois procurement records document ShotSpotter technology for Chicago expressway gunshot detection.
SoundThinking
The company announced in 2023 that ShotSpotter, the company, would operate under the SoundThinking name while ShotSpotter remained a product/technology brand.
PRODUCT / PLATFORM CAPABILITY
Published product capabilities
ShotSpotter
Acoustic sensors and software detect impulsive sounds, estimate likely gunfire locations, and send alerts for human review and response.
Acoustic network
The system's surveillance footprint depends on sensor placement and contracted coverage area.
Other SoundThinking products
SoundThinking markets additional public-safety technologies. Their existence does not establish Illinois use.
PRIVACY / GOVERNANCE QUESTIONS
Privacy and governance
Historical/current status matters
Chicago's CPD deployment is labeled historically confirmed because the relationship ended in 2024.
Performance and outcomes
Vendor claims, agency outcome claims and independent/OIG analysis should be presented separately.
Sensor scope
A contract for acoustic gunshot detection does not establish unrelated audio surveillance capabilities.
OFFICIAL PRODUCT INFORMATION
Vendor documentation
Vendor pages describe current products and features. Illinois deployment claims remain tied to Illinois-specific evidence.
EVIDENCE REFERENCES