Name: Cruel . Gender: Male or Female . Usage: Cruel is not a popular first name. It is more often used as a boy (male) or a girl (female) name. People having the name Cruel are in general originating from United States of America.
An earlier and less successful lie detector or polygraph machine was invented by James Mackenzie in 1902. However, the modern polygraph machine was invented by John Larson in 1921. John Larson, a University of California medical student, invented the modern lie detector (polygraph) in 1921. Used in police interrogation and investigation since 1924, the lie detector is still controversial among psychologists, and is not always judicially acceptable.
1 Capitol Polygraph, in Michigan, charges $325-$500 for most tests. 2  Home lie detectors are also available for about $90-$700, although the accuracy of home testing units and voice-based testers is not considered reliable.ie detector tests, also called polygraph tests, are used to determine whether a person is telling the truth. According to the American Polygraph Association, research has shown standard lie detector tests are 80%-98% accurate.