lie detector

[seminar class]

PRESENTED BY:
RAHUL KHARE

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LIE DETECTOR
WHAT IS LIE DETECTER
 Lie detectors are the instruments that monitor a person’s reactions.
 Detect only the displacement in deceptive behavior.
CIRCUIT DIAGRAM
WORKING OF LIE DETECTORS
 RESPIRATORY RATE.
 BLOOD PRESSURE.
 GALVANIC SKIN RESISTANCE.
 ARM AND LEG MOVEMENTS.
PHYSIOLOGICAL RESPONSES
 POLYGRAPH EXAMINERS
(PSYCHOPHYSIOLOGIST)
FUNCTIONS
1. Setting up the polygraph and preparing the subject being tested.
2. Asking questions.
3. Profiling the test subject.
4. Analyzing and evaluating test data.
REQUIREMENTS
 Five years of investigative experience and associative degree.
 Students must attend and pass a ten week intensive course.
 Students must enter an internship program and conduct a minimum of 25 exams for actual cases.
ERRORS
 FALSE POSITIVE- the response of a truthful person is determined to be deceptive.
 FALSE NEGATIVE-the response of deceptive person is determined to be truthful.
COMMON COUNTERMEASURES
 The idea of counter measures is to cause a certain reactions that will skew the test’s result.
 Sedatives.
 Antiperspirant on finger tips.
 Tacks placed in shoes.
 Biting tongue ,lip or cheek.
WHO USES POLYGRAPHS?
 National security(central intelligence agency,FBI,national security agency,ext).
 Criminal investigation.
 Pre employment screening.
 Internal affairs investigations of law enforcements.
 Banks.
SHORTCOMMINGS AND COUNTERMEASURES
 PRESSURE ON THE SUBJECT.
 NO STANDARD PAPER FOR POLYGRAPH EXAMINERS.
 COUNTERMEASURES.
 POSSIBILITY OF HUMAN ERRORS IS ALWAYS THERE.
CONCLUSION
 Testing the conductivity of the human body.
 Testing the conductivity of objects.
 Determining whether a houseplant needs watering.
 Determining whether a cake is cooked.
 ON THE BASIS OF MY STUDIED I HAD CONCLUDED THAT THIS MACHINE IS 70% CORRECT FOR LIE DETECTING AND 100% FOR OTHER PURPOSES.