ShotSpotter, rebranded as SoundThinking in April 2023, is a US gunshot detection vendor founded in 1996, headquartered in Newark, California. The company’s flagship product is an acoustic sensor network deployed across approximately 150 US cities, designed to detect gunshots within seconds, geolocate the source, and alert police dispatchers. The product has been deployed extensively in urban policing contexts, particularly in cities with substantial gun violence concerns. The deployments have been the subject of sustained policy and civil liberties controversy, including ACLU litigation in multiple jurisdictions.
What it means in practice
SoundThinking’s sensors are mounted on rooftops and utility poles in deployment areas, triangulating gunshot acoustic signatures to produce location estimates with claimed accuracy within 25 meters. Detections are reviewed by SoundThinking analysts and forwarded to police dispatchers as confirmed incidents. The company claims that the system increases police response time to gun violence incidents and produces evidence usable in subsequent prosecutions. Critics have argued that the detections are disproportionately deployed in lower-income and minority neighbourhoods, that the false positive rate is meaningful, and that the deployment model embeds police presence in specific communities.
Specific things to know
The ACLU and other civil liberties organisations have litigated against SoundThinking deployments in several US cities, including Chicago, where a 2024 city council decision terminated the SoundThinking contract following sustained community advocacy. The MacArthur Justice Center’s 2021 study of Chicago ShotSpotter alerts found that 89 percent did not result in gun-related crime evidence, and 86 percent did not result in a report of any crime. The company has disputed the methodology of these studies and continues to operate in many other US cities. The April 2023 rebrand from ShotSpotter to SoundThinking was framed by the company as a maturation step toward broader public safety products.
Change today
If you live in a SoundThinking deployment area, the operational answer is to recognise that acoustic surveillance has been added to your local urban infrastructure regardless of your individual situation. The audio analysis is automated and does not retain general background audio in normal operation, but the deployment context is a relevant data point for any threat model that includes domestic policing. For organisations considering deployment, the operational question is whether the system meets the operational goals it claims to meet, and the published research base suggests that this question deserves careful scrutiny.
Related articles
See our coverage of the Chicago contract termination, the MacArthur Justice Center research findings, and the broader civil liberties debate around acoustic gunshot detection in urban policing.