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It is claiming by psychologists that everyone lies at some time or other. Moreover, many people can lie without showing it in their facial expressions or body language. For this reason, lie detector tests are frequently use in police investigations. The use of such tests to detect lies is many hundreds of years old.
For example, it is believe that in China suspected liars were forced to chew rice powder and then spit it out. If the powder was dry, the suspect is considered guilty. In Spain, another variation for lie detection used. The suspect was being required to swallow a slice of bread and cheese. It was believed that if the bread stuck inside the suspect’s mouth, then he or she was lying. Psychologists report that these strange methods actually show a basic principle that is know about lying: Anxiety that is related to lying is linked to lack of saliva, or dry mouth.
Modern lie detectors, which are calling polygraphs, are used to indicate changes in heart rate, blood pressure, breathing rate, and perspiration while a person is be examined. Questions about the validity of the polygraph, however, are frequently raising. Consequently, results from polygraphs are often thrown out in legal cases.

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alina28551

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