Add Yahoo as a preferred source to see more of our stories on Google. American inventor John Larson, right, demonstrates the operation of a polygraph at Northwestern University in Evanston, Illinois, ...

The polygraph is not a lie detector but rather an instrument that measures a person’s physiological changes to questions posed by the examiner. An elevated physiological response to a particular ...

Northwestern University engineers have developed a small, wireless polygraph system you can wear. Unlike polygraphs used in ...

Instead, many experts say, the real utility of the polygraph machine, or "lie detector," is that many of the tens of thousands of people who are subjected to it each year believe that it works -- and ...

The Pearl River County Sheriff's Department has a new polygraph machine and a deputy to use it.Marc Ogden joined the Pearl River County Sheriff's Department staff about two months ago and brings with ...

Summary: Engineers and physicians developed a miniature, wireless polygraph system that is worn as a soft, lightweight ...

Until recently, the most famous application of the polygraph machine in the United Kingdom was probably the Jeremy Kyle Show. Unlike in the United States, where there are an estimated three million ...

A version of this story appeared in CNN’s What Matters newsletter. To get it in your inbox, sign up for free here. When President Ronald Reagan’s White House threatened thousands of government ...