How Effective Are Police? The Problem of Clearance Rates and Criminal Accountability

By Shima Baradaran Baughman  

In recent years, the national conversation in criminal justice has centered on police. Are police using excessive force? Should they be monitored more closely? Do technology and artificial intelligence improve policing? The implied core question across these national debates is whether police are effective at their jobs. Yet we have not explored how effective police are or determined how best to measure police effectiveness. This Article endeavors to measure how effectively police perform at their core function of crime. The metric most commonly used to measure police effectiveness at crime-solving is a "clearance rate:" the proportion of reported crimes for which police arrest a person and refer them for prosecution. But clearance rates are inadequate for many reasons, including the fact that thy are highly manipulable. This Article therefore provides a set of new metrics that have never been used systematically to study police effectiveness-referred to as "criminal accountability" metrics. Criminal accountability examines the full course of a crime to determine whether police detect and ultimately resolve the committed crime. Taking into account the prevalence and the number of crimes police solve, the proportion of crimes solved in America is dramatically lower than we realize. Only with a clearer conversation, rooted in accurate data about the effectiveness of the American police system, can we attempt a path toward increased criminal accountability and public safety. 

Alabama Law Review [Vol. 72:1:47  2020.