The main objective of the polygraph test in security screening is to identify people who present significant threats to national security. The aim is always to reduce to some minimum the number of false negative cases, to set this in the language of testing.
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The polygraph is frequently referred to as a lie detector, but it doesn't recognize lies. A specific physiological lie response has never been shown and is unlikely to exist. Instead, it records activity linked with arousal in the autonomic nervous-system.