lie detector essays

lie detector essays People tell lies and deceive others for many reasons. Most often, lying is a defense mechanism used to avoid trouble with the law, bosses or authority figures. Sometimes, you can tell when someone's lying, but other times it may not be so easy. Lie detectors are instruments that monitor a person's physiological reactions. A polygraph instrument is basically a combination of medical devices that are used to monitor changes occurring in the body. A person is questioned about a certain event or incident, the examiner looks to see how the person's heart rate, blood pressure, respiratory rate and electro-dermal activity (sweatiness) change in comparison to normal levels. Fluctuations may indicate that person is being deceptive, but exam results are open to interpretation by the examiner. The environments of a room are considerably important. The room should be completely quiet, not too dry or not too humanity. If it is too dry, then it can cause a cough. This will destroy the purpose of t est. The room also should be considered with room temperature and lighting. A person who is being tested should be block from any kinds of disturbances except by the examiner. The examiner also has to be a neat feature and use the standard language with a steady tone of voice. After done with a question, the examiner should not move for 25 seconds. The question shouldnt be too long or too short. After all of these requirements are satisfied, then the examiner is able to tell whether deceptive behavior is being displayed. A lie detector is not a device to detect lies rather it can detect whether deceptive behavior is being displayed. There is an ethical issue involved with lie detectors. Lie detectors are used in many places and situations like FBI, police departments, employments with permission of future employees, and etc. But we can not completely rely on the results with the device because some people can manipulate their results with controlling ...