The word polygraph means “many writings” in Greek, referring to the multiple physiological responses it records. Originally used for medical purposes in the 19th century, it now commonly refers to a truth-testing device. Modern polygraphs are computerized and use specialized software to assist examiners.
What does the polygraph record?
Modern polygraphs record five or more physiological signals, including breathing, skin moisture, pulse, blood pressure, & body movement. Sensors are placed on the chest, stomach, fingers, and arm. These sensitive instruments track changes throughout the test, which the examiner later analyzes to assess truthfulness or deception.
Is the examination confidential?
Yes, the test is confidential. Results are only shared with those named in a signed agreement, unless required by law.
How long does a polygraph examination take?
Most polygraph exams last 90–120 minutes, with most of the time spent in a standardized pre-test interview.
Will I know what questions are on the test?
Yes, All the four questions are reviewed by the partner & all questions are also reviewed with the person taking the test before the test begins.
Can nervousness affect the test results?
Everyone feels nervous during a polygraph—it is expected. Examiners look for changes in physiological patterns, not elevated levels like high blood pressure.
Can anyone beat a polygraph examination?
While no system is foolproof, attempts to beat a polygraph carry a high risk of detection. Research shows such methods often reduce the chances of passing.
How accurate is the polygraph?
Polygraph accuracy varies by approach, with event-specific tests showing 85–90% accuracy. Some other technique-focused studies report slightly over 90% accuracy.
What are some considerations that could make someone unsuitable for a polygraph test?
Unsuitable for polygraph testing:
Active psychosis or severe developmental issues
Drug/alcohol impairment or dementia
Inability to give consent or under age of consent
Extreme distress or inability to sit still
Medical conditions that prevent sensor placement
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