Cambridge Ends Contract with ShotSpotter Gunshot Detection System

A Massachusetts city has decided to terminate its contract with ShotSpotter, a gunshot detection system. This technology is used by police to detect potential shootings in real time. It employs a network of acoustic sensors atop streets to pick up gunfire-like sounds and alert law enforcement when a suspected shot occurs.

The Cambridge City Council’s decision follows criticism from detractors who claim the system is unreliable and may lead to over-policing. Concerns about its potential connection to federal immigration enforcement were also raised. Cambridge’s move aligns with Chicago’s earlier announcement in February 2024 that it would not renew its own contract for ShotSpotter, reflecting a growing pushback against its use in some cities.

According to Boston.com, the Cambridge city council vote resulted in five votes to terminate the contract, two against, and two abstentions. The city manager and police department must cease using ShotSpotter within 90 days, and the devices are to be removed from Cambridge locations, as reported by the outlet.

The system is run by SoundThinking, which states the technology aims to save lives, speed up police response, and assist investigators in collecting evidence. Alerts are sent to law enforcement within 60 seconds. Cambridge City Manager Yi-An Huang and acting Police Commissioner Pauline Wells supported keeping ShotSpotter, with police noting cases where the system detected gunfire without receiving 911 calls.

Critics argue that the technology lacks sufficient independent scientific validation. They point to reported false positives and claim it can be triggered by other loud noises like car backfires. Concerns also include the alleged link between SoundThinking’s law enforcement database and Immigration and Customs Enforcement (ICE), an unpopular agenda in Cambridge.

Councilor Ayah Al-Zubi, who co-sponsored the proposal to dismantle ShotSpotter, highlighted worries about data sharing and privacy risks. “The federal relationship with the company poses a privacy and safety risk for residents,” she stated. “Initially, there was interest in this technology over a decade ago, but we’ve learned more about its effectiveness and consequences.”

SoundThinking defended its technology, with a spokesperson stating, “ShotSpotter is proven, unbiased technology that aids police in responding to gunfire, gathering evidence, and providing lifesaving medical aid while safeguarding privacy. We remain dedicated to working with communities like Cambridge to protect residents against gun violence.”