Approximately 75,000 people in the United States were shot by a criminal assailant in 2024, yet most of those shootings did not result in an arrest.

In this HFG Research and Policy in Brief, Philip J. Cook, professor emeritus at Duke University, explores the gap between the minority of shootings that are solved and those that go unsolved.

“There is a strong argument for improving police performance in investigating serious crimes of violence,” Cook writes in Unsolved Shootings: Why and How to Boost Clearance Rates. “What is at stake is public safety and the basic duty of the police to serve the public.”

Cook examines the importance of arresting and prosecuting perpetrators of serious violence, the validity of “clearance rates” as a performance indicator for police departments, and what can be done by police to increase the success rate for criminal investigations—citing examples from Chicago, Denver, and other cities.

Read or download the report (PDF)