Cambridge Ends ShotSpotter Contract Amid Criticism
A city in Massachusetts decided on Monday to terminate its contract with ShotSpotter, a system designed for detecting gunfire in real time. This technology employs a network of acoustic sensors placed along roads, intending to quickly alert police when gunfire is suspected.
The Cambridge City Council’s choice comes after backlash from critics who argue the system is not reliable and could contribute to over-policing. They’ve also expressed worries about its potential connection to federal immigration enforcement.
This decision in Cambridge echoes a similar move made by Chicago, which announced it would not renew its contract for the technology in February 2024, pointing toward a growing skepticism about its effectiveness in various areas.
During the recent City Council meeting, five council members voted in favor of ending the contract, while two were against it, and two abstained. Following this decision, city officials, including police departments, have 90 days to cease using ShotSpotter and remove it from the city.
Support and Skepticism Surround Technology
Sound Thinking, the company behind the system, claims that ShotSpotter enhances safety, accelerates police responses, and aids investigations by relaying alerts within 60 seconds. They reference instances where police heard gunshots but weren’t contacted via 911 calls.
However, critics highlight a lack of independent scientific validation for the technology, pointing out that false positives might arise from loud noises other than gunshots, like car backfires. There are also concerns surrounding a database operated by Sound Thinking, which allegedly ties to Immigration and Customs Enforcement (ICE)—a connection that doesn’t sit well with many in Cambridge.
Councilor Aya Al-Zubi, who supported the resolution to phase out ShotSpotter, remarked that this deal raises broader issues about privacy and data sharing. “If the relationship with the federal government isn’t trustworthy, this could pose risks for our residents,” she noted, while reflecting on the changing perspective on this technology over the years.
In response to the criticisms, Sound Thinking defended its technology’s effectiveness, stating their commitment to serving the Cambridge community since 2014. The company describes ShotSpotter as a reliable tool that prioritizes residents’ safety while also respecting their privacy.

