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All about POLYGRAPHY

Polygraphy commonly known as LIE DETECTION.<br><br>Note: Presentation is not yet finished.

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All about POLYGRAPHY

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  1. All about polygraphy

  2. Limitations of the Polygraph Technique • It is an invaluable investigative aid, but never a substitute for investigation. • It is not a lie detector but only a scientific diagnosis instrument. • It does not determine facts, it records responses to that which the subject knows to be true. • It is only as accurate as the examiner is competent. • The test will not be given until enough facts have been gathered.

  3. Limitations of the Polygraph Technique • The test will not be given without the voluntary consent of the subject. • No guilty indication will be written on the examiner’s report if the subject refused to take the examination. • A test will not be given until the accusations have been explained to the subject. • No attempt to use the polygraph for mental or physical evaluation of any person. • No examination will be conducted on unfit subject.

  4. How accurate is polygraph testing? • 95 – 98% is the accuracy rate IF – it is conducted by a QUALIFIED, COMPETENT and EXPERIENCED examiner. • Polygraph test – most accurate tool in determining deception although there is a in accuracy due to the following factors:

  5. What factors generally affects polygraph testing?

  6. Generally, it is affected by:

  7. Specifically, 15% of errors are from: 1. Nervousness or extreme emotional tension experienced by the subject who is telling the truth regarding the offense in question but who is nevertheless affected by:

  8. Apprehension induced by the accusation directed against him/her • Apprehension over inaccurate lie detector result • Over anxiety • Apprehension over physical hurt from the instrument • Over anxiety regarding personal problems unrelated to the offense • Previous extensive interrogation • Guilt complex

  9. Physiological Abnormalities

  10. Excessively high or low blood pressure

  11. Diseases of the heart

  12. Respiratory failure

  13. Mental Abnormalities

  14. Terman's Stanford–Binet original (1916) classification IQ Range IQ Classification Above 140 "Near" genius or genius 120–140 Very superior intelligence 110–120 Superior intelligence 90–110 Normal, or average, intelligence 80–90 Dullness, rarely classifiable as feeble- mindedness 70–80 Border-line deficiency, sometimes classifiable as dullness, often as feeble-mindedness Below 70 Definite feeble-mindedness

  15. Psychosis a severe mental disorder in which thought and emotions are so impaired that contact is lost with external reality

  16. Paranoia A person who is paranoid

  17. Emotionally unstable persons

  18. Unresponsiveness

  19. No fear of detection • Apparent ability to consciously control response • A condition of “sub-shock” or “adrenal exhaustion” • Rationalization of the crime to such extent that lying about it arouses little or no emotional disturbance • Extensive interrogation • Attempt to “beat” the machine by controlled breathing or muscular flexing • Unobserved application of muscular pressure

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