NDLI: A Test of Case Linkage Principles with Solved and Unsolved Serial Rapes

Content Provider	Springer Nature Link
Author	Woodhams, Jessica Labuschagne, Gerard
Copyright Year	2011
Abstract	Case linkage involves identifying crime series on the basis of behavioral similarity and distinctiveness. Research regarding the behavioral consistency of serial rapists has accumulated; however, it has its limitations. One of these limitations is that convicted or solved crime series are exclusively sampled whereas, in practice, case linkage is applied to unsolved crimes. Further, concerns have been raised that previous studies might have reported inflated estimates of case linkage effectiveness due to sampling series that were first identified based on similar modus operandi (MO), thereby overestimating the degree of consistency and distinctiveness that would exist in naturalistic settings. We present the first study to overcome these limitations; we tested the assumptions of case linkage with a sample containing 1) offenses that remain unsolved, and 2) crime series that were first identified as possible series through DNA matches, rather than similar MO. Twenty-two series consisting of 119 rapes from South Africa were used to create a dataset of 7021 crime pairs. Comparisons of crime pairs that were linked using MO vs. DNA revealed significant, but small differences in behavioral similarity with MO-linked crimes being characterized by greater similarity. When combining these two types of crimes together, linked pairs (those committed by the same serial offender) were significantly more similar in MO behavior than unlinked pairs (those committed by two different offenders) and could be differentiated from them. These findings support the underlying assumptions of case linkage. Additional factors thought to impact on linkage accuracy were also investigated.
Starting Page	85
Ending Page	98
Page Count	14
File Format	PDF
ISSN	08820783
Journal	Journal of Police and Criminal Psychology
Volume Number	27
Issue Number	1
e-ISSN	19366469
Language	English
Publisher	Springer US
Publisher Date	2011-07-13
Publisher Institution	Society for Police and Criminal Psychology
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Comparative case analysis Linkage analysis Behavioral linking Sexual assault Sexual offense Criminology & Criminal Justice Law and Psychology Psychology
Content Type	Text
Resource Type	Article
Subject	Law Applied Psychology

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