As ShotSpotter rolls out in Tacoma, feelings over gunshot detection technology remain mixed

Jan 8, 2025

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In an effort to curb gun crime, Tacoma announced last year that it was turning to a tool called ShotSpotter.

ShotSpotter is a form of Gun Detection Technology (GDT), which uses a series of acoustic microphone sensors to track loud bangs, booms, and pops in a designated area. Once those "dynamic events" are triggered, a human classifier verifies the sound was a gunshot and alerts local police. The entire process happens within 60 seconds or less.

The idea is that it’s a faster and more accurate way to alert police to gunshots, compared with relying on 911 calls. That, then, allows police to get to a more targeted crime scene sooner, and have more evidence to ideally solve the crime.

SoundThinking, the company that runs ShotSpotter, says the technology has been used in more than 180 cities globally.

However, the technology has been controversial in several large cities. Houston’s mayor called ShotSpotter a “gimmick” when he announced plans to scrap the city’s contract. After years of debate over its effectiveness, Chicago ended its use of Shotspotter in September.

Seattle Mayor Bruce Harrell advocated for years for using an acoustic gunshot detection technology in Seattle before backing off his plan to fund a pilot program last year.

Tacoma is moving forward with ShotSpotter, thanks to an $800,000 grant from the Bureau of Justice Assistance. That grant will fund three different kinds of technology aimed at improving the city’s ability to investigate gun crimes. The police department is on the verge of piloting ShotSpotter in a two square mile area around Hosmer Street, in South Tacoma.

Tacoma Police told us the city's ShotSpotter rollout is now slated for Spring 2025.

But some in the city are concerned about the cost and accuracy of ShotSpotter, and say it might lead to greater police presence and surveillance in communities that have long suffered from over policing.

To learn more, Soundside spoke with a group of community advocates who've spoken against the technology at ShotSpotter information sessions in Tacoma; Alfred Lewers Jr., the Senior Director of Trauma Response and Community Engagement at SoundThinking; and Eric Piza, a professor of Criminology and Criminal Justice at Northeastern University in Boston who's studied the use of ShotSpotter in major cities like Chicago and Kansas City.

Guests:

Latasha Palmer, community advocate and board secretary of the Hilltop Action Coalition.
Bunchy Carter, minister of defense for the Black Panther Party in Tacoma.
Oneida Arnold, long term member of The Conversation 253, a Tacoma and South Sound community group.
Alfred Lewers Jr., senior director of trauma response and community engagement at SoundThinking, the company that oversees ShotSpotter.
Eric Piza, professor of criminology and criminal justice at Northeastern University in Boston.

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