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Journal of Law, Economics, and Organization Advance Access published online on September 3, 2007
Journal of Law, Economics, and Organization, doi:10.1093/jleo/ewm043
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The Effects of the Fourth Amendment: An Economic Analysis

Hugo M. Mialon*

Emory University

Sue H. Mialon**

University of North Dakota

* Department of Economics, Emory University. Email: hmialon{at}emory.edu

** Department of Economics, University of North Dakota. Email: sue.mialon{at}und.edu.

We develop an economic model of crime and search that allows us to analyze the effects of the Fourth Amendment's exclusionary rule on crime and privacy. We find that the rule always increases crime but has two opposing effects on searches. It directly reduces searches by reducing the chances that they lead to successful conviction, but it also indirectly increases them by increasing crime. If its indirect effect dominates, the rule actually increases searches and has an ambiguous effect on wrongful searches. If its direct effect dominates, it reduces wrongful searches, thereby protecting privacy. Its direct effect is more likely to dominate the greater is the number of police officers per capita, the lower is the police's incentive to simply close cases and the more accountable the police are for their mistakes. Police accountability also increases crime but unambiguously reduces wrongful searches. We also explore the effects of long-term progress in search technology on crime and privacy.


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