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NCJ Number: 148968 Find in a Library
Title: Is the Guilty Knowledge Polygraph Technique Applicable in Criminal Investigations? A Review of FBI Case Records
Journal: Polygraph  Volume:23  Issue:1  Dated:(1994)  Pages:85-94
Author(s): J A Podlesny
Date Published: 1994
Page Count: 10
Type: Research (Applied/Empirical)
Format: Article
Language: English
Country: United States of America
Annotation: This study reviewed a sample of closed criminal cases in which control-question polygraph examinations had been used to assess the possible applicability of the Guilty Knowledge Technique in those cases.
Abstract: The Guilty Knowledge Technique is a method that involves the detection of knowledge about a crime as a means for inferring deception. It has been promoted as an alternative or replacement for the commonly used Control- Question Technique in investigative polygraph examinations; however, guilty-knowledge tests have rarely been used in actual investigations, and some authors have suggested that practical considerations prevent their widespread use. The current study found that guilty-knowledge tests might have been used in 13.1 percent of the examinations (95 percent confidence interval for similarly selected examinations: 4.9 percent to 21.4 percent). A large proportion of the remaining examinations were conducted under circumstances that would not be amenable to the use of guilty-knowledge tests, even with much effort. The results, although not fully conclusive for reasons that are discussed, indicate that the Guilty Knowledge Technique might be applied in a small proportion of FBI cases, but there is no basis to consider it as a general replacement for current methods. Recent reports of novel physiological parameters and methods of analysis for use with guilty-knowledge tests may be of limited value in criminal investigations. 35 references
Main Term(s): Criminology
Index Term(s): Courts; Polygraph reliability; Polygraph techniques
Note: This article was previously published in the FBI Crime Laboratory Digest (July 1993).
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