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DETECTION OF DECEPTION, VERIFIABILITY APPROACH, UNANTICIPATED QUESTIONS /…
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VERIFIABILITY APPROACH
Verifiable detail’ is a detail in a suspect’s statement that can be objectively checked via another source.
NAHARI ET AL 2014
Examined the hypothesis that liars will report their activities strategically and will, if possible, avoid mentioning details that can be verified by the investigator.
38 participants wrote a statement in which they told the truth or lied about their activities during a recent 30-minute period
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HARVEY ET AL 2017
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RESULTS
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Model statements seem to make it easier for truthful, but not untruthful, interviewees to include more verifiable details
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ALTERNATIVE TO POLYGRAPH
GUILTY KNOWLEDGE TEST
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Person who shows physiological response to at least 5 out of 6 ‘correct’ answers is deemed to have guilty knowledge - otherwise unlikely to hit 5 out of 6
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