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NCJ Number: 157431 Find in a Library
Title: Validity Assessment of Written Statements From Suspects in Criminal Investigations Using the Scan Technique
Journal: Police Studies  Volume:17  Issue:4  Dated:(Winter 1994)  Pages:77-88
Author(s): L N Driscoll
Date Published: 1994
Page Count: 12
Type: Report (Technical)
Format: Article
Language: English
Country: United States of America
Annotation: An initial study of the Scientific Content Analysis (SCAN) technique indicates that it is capable, within limits, of differentiating between probably accurate statements and likely false statements of suspects in criminal investigations.
Abstract: The SCAN technique is based on several fundamental assumptions. The most basic assumption suggests a difference between truthful and deceptive persons. Another assumption is that each of the subject's unassisted words represents important data. Using SCAN criteria, a study was conducted to evaluate 30 written statements voluntarily given by subjects, 25 males and 5 females, immediately prior to the administration of a criminal investigative polygraph examination. The SCAN technique assessed statement validity by circling or noting through a color code the location of SCAN criteria within the statement transcript. The SCAN technique appeared to be reasonably accurate and compared favorably with other lie detection techniques, in particular the polygraph examination. Further research is recommended to refine the definition of SCAN criteria and the scoring system used in the analysis. 23 references and 4 tables
Main Term(s): Criminology
Index Term(s): Corrections; Courts; Criminal investigation; Police; Polygraph reliability; Polygraph techniques; Science and Technology; Suspect identification; Suspect interrogation
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