What parent, at one time or another, hasn’t wished for an absolutely reliable, invisible lie-detector? What business professional interviewing a potential hire hasn’t wished for exactly the same thing? Now I know what you’re thinking. ‘Invisible’ is impossible. True, but so is ‘absolutely reliable lie-detector,’ so I saw no harm in adding ‘invisible’ to the wish list.
It is true that stress can cause various physiological responses like elevated blood pressure and sweating. It is also true that these can be measured by a polygraph but for good reason, most legal jurisdictions allow polygraph results only for investigatory purposes, not for gaining a conviction. Factors other than lying can cause the same physiological responses and too many people can lie without presenting these physical reactions. (more…)