Polygraphy | Lie Detection Test | Forensic Science Notes

To get notes, visit my website: https://forensicsciencehub.com Y­ou hear about lie detectors all the time in police investigations, and sometimes a person applying for a job will have to undergo a polygraph test (for example, certain government jobs with the FBI or CIA require polygraph tests). The goal of a lie detector is to see if the person is telling the truth or lying when answering certain questions. When a person takes a polygraph test, four to six sensors are attached to him. A polygraph is a machine in which the multiple ("poly") signals from the sensors are recorded on a single strip of moving paper ("graph"). The sensors usually record: The person's breathing rate The person's pulse The person's blood pressure The person's perspiration When a well-trained examiner uses a polygraph, he or she can detect lying with high accuracy. However, because the examiner's interpretation is subjective and because different people react differently to lying, a polygraph test is not perfect and can be fooled. Brain fingerprinting video link: https://youtu.be/ldnKuwhlgbw Narco analysis video link: https://youtu.be/PDlIficsIKU For More Subscribe now... #forensic #science #ugcnet Join our whatsapp group: https://chat.whatsapp.com/E8kMU67rlTK5HyXpoVykuP Here I am sharing videos about Forensic Science topics, Subscribe for more: Channel Link: https://www.youtube.com/channel/UCsQMjA9a2KJ3FfrIP4RprE