While I have an admitted affinity for asking simple questions, sometimes it's the "simple" question that can help point the way toward more sophisticated empirical work. A recent paper by Andrew Leipold (Ill.), The Puzzle of Clearance Rates, and What They Can Tell Us About Crime, Police Reform, and Criminal Justice, makes my point.
The paper begins by framing its core research question: "Recent incidents of police violence have led to widespread reform efforts, from modest proposals to change police practices to dramatic attempts to slash funding or abolish the police entirely. But largely ignored in the debate is a simple question – how well is law enforcement currently performing its core functions? In particular, how good are the police at finding the perpetrator, arresting that person, and gathering enough evidence to start the matter through the criminal justice system?"
Exploring police clearance rate data engages the question. And what Leipold finds is that "Clearance rates for violent and property crimes have been both quite low and amazingly steady for the last 40 years. These figures are counterintuitive, because during that same period, crime first rose and then decreased dramatically; law enforcement personnel numbers increased, and then flattened; and the legal enforcement landscape appears to have tilted in the direction of the police and prosecution. Each of these changes should have significantly affected the clearance rates, but even collectively, they did not."
The presentation of basic descriptive trend data amply supports Leipold's point. And what he argues is that "[w]hile there is no single explanation, the diversion of resources from index crimes and a change in focus toward crime prevention seem to have the most explanatory power." While how to interpret--or explain--the counterintuitive trends, of course, remains ripe for future work, part of the power of initial descriptive work is that it helps bring into sharper relief avenues for deeper and more methodologically sophisticated future research.
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