Abstract
The Concealed Information Test (CIT) is a psychophysiological technique for examining whether a person has knowledge of crime-relevant information. Many laboratory studies have shown that the CIT has good scientific validity. However, the CIT has seldom been used for actual criminal investigations. One successful exception is its use by the Japanese police. In Japan, the CIT has been widely used for criminal investigations, although its probative force in court is not strong. In this paper, we first review the current use of the field CIT in Japan. Then, we discuss two possible approaches to increase its probative force: sophisticated statistical judgment methods and combining new psychophysiological measures with classic autonomic measures. On the basis of these considerations, we propose several suggestions for future practice and research involving the field CIT.
Highlights
High www.frontiersin.org to the autonomic-based CIT instead of altering the current field CIT completely to use alternative measures
SUMMARY In the present paper, we reviewed how the CIT has been used for field criminal investigations in Japan, and suggest that with appropriate training and institutional support, the CIT can frequently be used in field applications
We reviewed various statistical methods and potential new measures, which may contribute to improved validity and increased probative value of the CIT
Summary
High www.frontiersin.org to the autonomic-based CIT instead of altering the current field CIT completely to use alternative measures. The respiration line length decreases when respiration is suppressed (i.e., shorter respiratory time and smaller amplitude), and is a good measure for the CIT. To fully resolve this bias problem, a new quantification method – a weighted average respiration line length – has been recently proposed (Matsuda and Ogawa, 2011).
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