NCJ Number
191345
Journal
Polygraph Volume: 30 Issue: 1 Dated: 2001 Pages: 43-46
Editor(s)
Donald Krapohl
Date Published
2001
Length
4 pages
Annotation
This article examines the Guilty Knowledge Test (GKT) polygraph test.
Abstract
There are several reasons for field examiners to consider using the Guilty Knowledge Test (GKT). There is more general agreement in the scientific community regarding the defensibility of the theory underlying GKT. The GKT is also very simple to administer, and permits the user to calculate the precise probability of a false positive error. One of the limiting factors for the GKT is the availability of critical test items. The success of the GKT depends on investigators having access to crime details that have not been released to the public or the examinee. Overall, the GKT is an elegant and powerful testing technique with many important advantages. Its only significant shortcoming is that it cannot be used in all cases, but only those in which there are a sufficient number of critical test items. Examiners are encouraged to use GKT as another tool at their disposal.