Leonarde Keeler (left) testing his polygraph machine on Marjorie Creighton in presence of August Vollmer during a trial in Chicago in 1932. Staff Writer In advance of her appearance on Thursday before ...

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 ...

When teachers were accused of fondling or sexual harassing students, Springfield school officials at times used an unusual, and troubling, tool to investigate — they had them take a polygraph test.

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 ...