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SEMINAR TOPIC

LIE DETECTOR

PRESENTED BY:

RAHUL KHARE

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WHAT IS LIE DETECTER

Lie detectors are the instrumentsthat monitor a persons reactions.

Detect only the displacement indeceptive behavior.

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CIRCUIT DIAGRAM

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WORKING OF LIE

DETECTORS

RESPIRATORY RATE.

BLOOD PRESSURE. GALVANIC SKIN RESISTANCE.

ARM AND LEG MOVEMENTS.

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PHYSIOLOGICAL

RESPONSES

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REQUIREMENTS

Five years of investigativeexperience and associative degree.

Students must attend and pass a tenweek intensive course.

Students must enter an internship

program and conduct a minimum of25 exams for actual cases.

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ERRORS

FALSE POSITIVE- the response of atruthful person is determined to be

deceptive. FALSE NEGATIVE-the response of

deceptive person is determined to be

truthful.

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COMMON COUNTERMEASURES

The idea of counter measures is tocause a certain reactions that willskew the tests result.

Sedatives.

Antiperspirant on finger tips.

Tacks placed in shoes. Biting tongue ,lip or cheek.

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WHO USES

POLYGRAPHS?

National security(central intelligenceagency,FBI,national security

agency,ext). Criminal investigation.

Pre employment screening.

Internal affairs investigations of lawenforcements.

Banks.

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SHORTCOMMINGS AND

COUNTERMEASURES

PRESSURE ON THE SUBJECT.

NO STANDARD PAPER FOR

POLYGRAPH EXAMINERS.

COUNTERMEASURES.

POSSIBILITY OF HUMAN ERRORS ISALWAYS THERE.

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CONCLUSION

Testing the conductivity of the humanbody.

Testing the conductivity of objects. Determining whether a houseplant

needs watering.

Determining whether a cake iscooked.

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CONCLUSION CONTINUED

ON THE BASIS OF MY STUDIED I HADCONCLUDED THAT THIS MACHINE IS70% CORRECT FOR LIE DETECTING

AND 100% FOR OTHER PURPOSES.

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THANK YOU

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