National Research Council of the US formed a group of psychologists (which included Marston) commissioned to test available “lie detection” methods in order to resolve the counterintelligence In 1913 psychologist and lawyer William Marston started regular scientific research of instrumental method of “lie detection”. During WWI when the struggle against German spies was especially tense issue.
After conducting the appropriate research the experts drew a conclusion that the most effective way of detection was the so-called “bloodpressure deception test” devised by W. Marston in Harvard Psychological Laboratory. This test was 97% effective.
According to experts, there is no direct connection between physiological measures and honesty. “Lie detector” registers person’s level of excitement, but it is unable to detect its real reason. Polygraph examiner always has the last word.