much as none of these studies isolates the determination of truth from performance on the polygraph examination, they share a bias that must inflate apparent accuracy, perhaps to a significant degree. This result, in conjunction with the tendency for diagnostic test performance to degrade in field application relative to under laboratory conditions, leads us to believe that actual polygraph test performance in the field, if it could be measured against actual truth, would show a lower level of accuracy than indicated by the field or laboratory datasets we examined.



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