skip navigation


Register for Latest Research

Stay Informed
Register with NCJRS to receive NCJRS's biweekly e-newsletter JUSTINFO and additional periodic emails from NCJRS and the NCJRS federal sponsors that highlight the latest research published or sponsored by the Office of Justice Programs.

NCJRS Abstract

The document referenced below is part of the NCJRS Virtual Library collection. To conduct further searches of the collection, visit the Virtual Library. See the Obtain Documents page for direction on how to access resources online, via mail, through interlibrary loans, or in a local library.


NCJ Number: 82920 Find in a Library
Title: Patrol by Helicopter - An Evaluation (From First National Conference on Criminal Justice Evaluation - Selected Papers, P 59-73, 1981, Joel H Garner and Victoria Jaycox, ed. - See NCJ-82918)
Author(s): J F Schnelle; R Kirchner
Date Published: 1981
Page Count: 15
Sponsoring Agency: National Institute of Justice/
Rockville, MD 20849
Sale Source: National Institute of Justice/
NCJRS paper reproduction
Box 6000, Dept F
Rockville, MD 20849
United States of America
Document: PDF
Language: English
Country: United States of America
Annotation: The cost-benefit of using a police helicopter patrol to prevent burglaries in a high-crime area of Nashville, Tenn., is examined.
Abstract: The helicopter was initially flown on patrol for 12 days and then grounded because of cost limitations. This arrangement was conducive to an interrupted time-series evaluation design with burglary measures taken before intervention, during intervention, and after intervention. Data indicated a decrease in burglaries from baseline to the helicopter-patrol period and an increase in home burglaries from the helicopter period to the postpatrol period. This finding prompted an additional evaluation step designed to strengthen the initial evaluation design. The procedure was replicated for an additional 12 days. This permitted an analysis of the helicopter during five conditions: prior to initial patrol (baseline), during first patrol (first intervention), after the first patrol (second baseline), during the second helicopter patrol (second intervention), and after the second intervention (third baseline). The burglary deterrence effects of the helicopter patrol were replicated in the second intervention. To estimate the cost-benefit comparisons between helicopter patrol and nonhelicopter patrol, the total amount of property loss resulting from burglaries was added to the marginal costs of the helicopter patrol. A positive cost-benefit ratio was shown in two high-density population target are as, while cost-benefits were negative in two low-density areas. Tabular and graphic data are provided, along with a bibliography of nine listings.
Index Term(s): Aerial patrol; Burglary; Crime specific countermeasures; Evaluation; Police crime-prevention
Note: Available on microfiche as NCJ-82918
To cite this abstract, use the following link:

*A link to the full-text document is provided whenever possible. For documents not available online, a link to the publisher's website is provided. Tell us how you use the NCJRS Library and Abstracts Database - send us your feedback.