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Detecting false intent by strategic use of evidence

Conference paper
Authors Franziska Clemens
Pär-Anders Granhag
Leif Strömwall
Published in 20th Conference of the European Association of Psychology and Law, 15-18 juni 2010, Göteborg
Publication year 2010
Published at Department of Psychology
Language en
Keywords Intention, Deception detection, Interview technique, Strategic use of evidence
Subject categories Psychology

Abstract

Previous research has shown the potential of late disclosure of evidence as a deception detection tool, since this manner of interviewing produces reliable differences between liars and truth tellers in terms of statement-evidence inconsistency. This study examined whether these results could be replicated in the detection of false intent. Participants (N = 120) were randomly allocated to one of two veracity conditions (truth tellers vs. liars) and instructed to either plan a mock-criminal or a non-criminal act. The participants were made to believe that they would carry out their planned actions. In addition to planning their criminal act, the liars were encouraged to prepare a cover story to use in case they were intercepted. All participants were intercepted before they could accomplish their mission and subsequently interrogated. During the interrogations evidence (web browser history, fingerprints, eyewitness) speaking to the suspects’ guilt was disclosed either early or late. We hypothesized that the late disclosure condition would elicit significantly more cues to deception than the early disclosure condition. The results, as well as the practical implications, of this study will be discussed.

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