what purpose do these instruments serve by telling the truth . In M.O.V
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Lie detection is an assessment of a verbal statement with the goal to reveal a possible intentional deceit. Lie detection may refer to a cognitive process of detecting deception by evaluating message content as well as non-verbal cues.[1] It also may refer to questioning techniques used along with technology that record physiological functions to ascertain truth and falsehood in response. The latter is commonly used by law enforcement in the United States, but rarely in other countries because it is based on pseudoscience.
There are a wide variety of technologies available for this purpose.[2] The most common and long used measure is the polygraph. A comprehensive 2003 review by the National Academy of Sciences of existing research concluded that there was "little basis for the expectation that a polygraph test could have extremely high accuracy."[3] There is no evidence to substantiate that non-verbal lie detection, such as by looking at body language, is an effective way to detect lies, even if it is widely used by law enforcement.[
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Our society is affected by the lie detector through, new jobs, entertainment, and lowered crime rates. ... Society was also effected by the crime rates. Criminals are more timid to rob a store it they know they could be caught lying later. The polygraph makes the world a safer place for the people of America.
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