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 ...

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, ...

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.