Lie detector_Instrument_Which detect lies
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This document provides an overview of lie detectors, how they work, and their accuracy. It discusses that lie detectors monitor physiological reactions like heart rate, breathing, and sweat to determine if a person is lying. However, they are only about 85-90% accurate as results can depend on the person's character, openness, and the examiner. While sometimes used by law enforcement, polygraph results are rarely admissible in court due to their imperfect nature.
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The document discusses the history and development of the polygraph, or lie detector test. It notes that Cesare Lombroso invented the first device to measure changes in blood pressure in 1895. John Larson invented the modern polygraph in 1921. The document outlines the key principles behind how polygraphs work to detect deception based on physiological responses. It also discusses the development of polygraphs in India, the testing process, types of questions asked, accuracy rates, and legal issues regarding their use.
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Lie detector_Instrument_Which detect lies
- 2. Contents - General idea about lie detector. - How does it really works ? - Do the lie detector really accurate? - How will be the questions of investigator.? - Can we fool the lie detector machine ? - It is legal or illegal ?
- 3. Signs that a person is lying - First of all a lie is a false statement or give a wrong impression to someone. - Nervous smiling. - Prounciation mistakes. - Facial and body Responces. - Eye contact. - Timing and unnatural silence.
- 4. Do you think it is really exsists? - Lie detector is a instrument which detect whether the person telling lies or not. - A polygraph is a combination of medical devices that are used to monitor changes occurring in the body. - It monitors and give the graph of pysiological reactions
- 5. Invention - First polygraph test conducted during the world war I in 1917. But it is not very much success. - New model of polygraph was invented in 1921 by a medical student of california university john agustus larson. - At the time of world wars berkeley police department suggested him to invent.
- 6. How does it really works ? - By observing physiological reactions like -Heart rate -Respiration rate -Electro thermal activity -Change in blood pressure -skin conductivity -eye movement
- 7. How to set up polygraph test?
- 9. Observing results - It depending upon investigator only. - Experience of investigator is most important thing.
- 10. Medical kit - Body movement sensors - Electrocardiogram - Galvanic skin resoponce sensor - Skin sensors
- 11. Interrogation questions like - Start with control questions to recognize regular behavior. - After contro questions he gets to truth. - What restaurants do you recommend? What kind of food do they serve? - Have you ever lied to your best friend? What did you say to them? - In the past month, you not answered someone’s
- 12. What is validity of lie detector??? - Just 85 to 90% accurate,not more than that. - Its depends upon the comparing results also. - Mostly depends upon the person character * Innocent or not. * Open himself or not. - Depends upon examiner also.
- 13. - Say only yes or no answers. - Breathe normally. - To confuse the test from the start, you might tense your muscles. - Answer questions directly and seriously. - Seeing that you appear to be not afraid of his machine. - Answer control questions strangely. Can you beat a lie detector?
- 14. Legalities - Rarely admissible in court - New Mexico is the only state that allows for open admissibility of polygraph exam results. - First time in 2008,once polygraph used in court in india - In 2010 Supreme court of india declared polygraph tests are against to the constitution.
- 15. Used as - Police department is used as investgation tool. - Others are used to detect someone is lying or not. . - Faster public confidence on in law enforcement. - National security.
- 16. Thank you very much