Acoustic Gunshot Detection Systems

Acoustic gun detection systems (AGDS) are a law enforcement technology designed to detect gunshot sounds and notify police of the event and location in close to real time. ShotSpotter is the most well-known AGDS in the United States, sold by a company of the same name. In what follows, we analyze ShotSpotter and the company’s claims that the system improves safety, reduces crime, and promotes positive relationships between communities and police. We conclude that the technology’s accuracy, effectiveness, cost, and systemic biases raise serious concerns. Communities concerned with local law...

Automated License Plate Readers (ALPRs) are a surveillance technology that can alert law enforcement about vehicle locations in real-time or provide information on past movements. In recent years, growing numbers of public and private entities have begun using ALPRs, moving some communities to implement policies aimed at limiting the potential damage posed by the technology. This memo analyzes legal and policy concerns related to the technology. It concludes by suggesting policy options that communities can advocate for, including a ban or moratorium and appropriate safeguards if the...