National Archive of Criminal Justice Data

This dataset is maintained and distributed by the National Archive of Criminal Justice Data (NACJD), the criminal justice archive within ICPSR. NACJD is primarily sponsored by three agencies within the U.S. Department of Justice: the Bureau of Justice Statistics, the National Institute of Justice, and the Office of Juvenile Justice and Delinquency Prevention.

Effects of "United States vs. Leon" on Police Search Warrant Practices, 1984-1985 (ICPSR 9348)

Principal Investigator(s):


This data collection examines the impact of the Supreme Court decision in "UNITED STATES VS. LEON" on police search warrant applications in seven jurisdictions. For this collection, which is one of the few data collections currently available for the study of warrant activities, data were gathered from search warrant applications filed during a three-month period before the Leon decision and three months after it. Each warrant application can be tracked through the criminal justice system to its disposition. The file contains variables on the contents of the warrant such as rank of applicant, specific area of search, offense type, material sought, basis of evidence, status of informants, and reference to good faith. Additional variables concern the results of the warrant application and include items such as materials seized, arrest made, cases charged by prosecutor, type of attorney, whether a motion to suppress the warrant was filed, outcomes of motions, appeal status, and number of arrestees.

Access Notes

  • One or more data files in this study are set up in a non-standard format, such as card image format. Users may need help converting these files before they can be used for analysis.

  • These data are freely available.


DS0:  Study-Level Files
DS1:  Jurisdiction of River - Download All Files (0.8 MB)
DS2:  Jurisdiction of Mountain - Download All Files (0.8 MB)
DS3:  Jurisdiction of Plains - Download All Files (0.8 MB)
DS4:  Jurisdiction of Border - Download All Files (0.8 MB)
DS5:  Jurisdiction of Hill - Download All Files (0.8 MB)
DS6:  Jurisdiction of Forest - Download All Files (0.8 MB)
DS7:  Jurisdiction of Harbor - Download All Files (1 MB)

Study Description


Uchida, Craig D. EFFECTS OF "UNITED STATES VS. LEON" ON POLICE SEARCH WARRANT PRACTICES, 1984-1985. Washington, DC: Police Executive Research Forum [producer], 1986. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 1990.

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This study was funded by:

  • United States Department of Justice. Office of Justice Programs. National Institute of Justice (85-IJ-CX-0015)

Scope of Study

Subject Terms:   criminal justice system, disposition (legal), search warrants, Supreme Court decisions, United States Supreme Court

Geographic Coverage:   United States

Date of Collection:  

  • 1985

Universe:   All search warrants filed in the United States in 1984 and 1985.

Data Types:   event-transaction data


Data Source:

search warrants applications


Original ICPSR Release:  

Version History:

  • 2006-01-12 All files were removed from dataset 8 and flagged as study-level files, so that they will accompany all downloads.
  • 2006-01-12 All files were removed from dataset 8 and flagged as study-level files, so that they will accompany all downloads.

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