WORCESTER—The city’s use of gunshot detection technology has reached a critical point of reflection, as the city continues its partnership with ShotSpotter—an acoustic surveillance system that has become a key element of the Worcester Police Department’s efforts to respond to and investigate gun violence.
According to information shared with the Worcester City Council on April 15, Police Chief Paul Saucier outlined the full timeline and current impact of the program, which first launched in the city in 2014. Now under its fourth contract, ShotSpotter and its complementary data tool, Resource Router, are in use through at least April 2026, at an annual cost of about $573,563.
Saucier emphasized that ShotSpotter is not just a detection tool—it has become a crucial link in the city’s gun crime investigations. In 2024, the system detected 344 potential incidents, 105 of which were confirmed as involving gunfire. Of those 105 confirmed cases, 84 resulted in a ShotSpotter alert. In 39 of those 84 incidents, no 911 call was made—meaning the technology alone triggered the police response.
“This allows officers to collect physical evidence they may have otherwise lost,” Saucier noted in the report.
That physical evidence is now processed by Worcester’s recently formed Crime Gun Intelligence Unit (CGIU), which works in tandem with federal partners at the ATF and the Worcester District Attorney’s Office.
In 2024, the CGIU confiscated 24 firearms and made 44 arrests, with a third of the weapons—eight guns—tied to ShotSpotter alerts. One of the more serious incidents involved the arrest of a juvenile who was allegedly firing an automatic weapon at vehicles on I-290. The alert came from ShotSpotter, and led to the recovery of the weapon after a targeted investigation.
The department continues to use the digital evidence from ShotSpotter activations—brief audio clips delivered directly to officers’ cruisers and phones—to help determine the nature of the gunfire. This can provide clues about whether shots were fired from a fully automatic weapon, whether there were multiple shooters, or if the shooter was in motion. That, Saucier wrote, “enhances officers’ safety.”
ShotSpotter works by triangulating loud, impulsive sounds—like gunshots—through an array of sensors across an eight-square-mile coverage area in Worcester. According to the chief’s report, 772 shell casings were collected from within this area last year. The coverage was mapped based on historical data involving shootings and homicides. Of the 24 gun homicides in Worcester from 2022 through 2024, 14 occurred in ShotSpotter’s coverage zone.
However, the system doesn’t identify suspects or use cameras, and its alerts alone do not provide legal justification for stops without corroborating information. The Massachusetts case Commonwealth v. was cited in the chief’s communication to illustrate this point, though the full reference was not included in the document shared with council.
A previous Worcester Guardian story on the technology highlighted community concerns about surveillance, false positives, and the system’s placement in specific neighborhoods. But it also supported its value in generating leads that might otherwise go unnoticed.
The contract with ShotSpotter—now owned by SoundThinking—includes not only gunfire detection but also Resource Router, a software tool that helps allocate police resources based on data. The city pays roughly $44,966 per year for Resource Router, and $528,597 for the core ShotSpotter technology.
As the city approaches the final year of its current contract, questions about its renewal and effectiveness are likely to emerge again—balancing cost, community input, and data-driven policing.
But for now, Worcester police and city leaders see it as one of the tools “in the toolbox” to keep residents safe, especially as gun violence continues to pose challenges in urban centers across the country.
Have news, tips, or a story worth telling? Reach Editor Charlene Arsenault at carsenault@theworcesterguardian.org—because good stories (and great scoops) deserve to be shared.
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