I studied ShotSpotter in Chicago and Kansas City – here’s what people in Detroit and the more than 167 other cities and towns using this technology should know

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.)

Eric L. Piza, Northeastern University

(THE CONVERSATION) Like many large cities in the U.S., Detroit’s gun violence rate has fluctuated since the COVID-19 pandemic and the unrest after the murder of George Floyd in 2020. The city’s murder rate increased nearly 20% that year, meaning the city had the second-highest violent crime rate after Memphis, Tennessee, among cities with more than 100,000 residents.

However, by the end of 2023, nonfatal shootings dropped nearly 16% from the prior year and homicides returned to pre-pandemic levels, with this reduction continuing so far in 2024.

Focusing on citywide crime rates, however, can hide significant local variations. Research shows that in most cities, fewer than 5% of city blocks account for about 50% of all crime. This means a small number of residents are at the highest risk of becoming the victim of crime, even when overall rates decline.

High-profile incidents, like the recent mass shooting that killed two and injured...