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, ...

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.

Here’s a video of Marston using a polygraph-like machine and claiming to identify the varying emotions of blonde, brunette and redheaded women. His conclusion was that redheads like to gamble, ...