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.

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 ...

A technical glitch in the LX4000 polygraph machine that has produced errors in its sweat measurements arose in one of the three machines used by the Beaufort County Sheriff's Office between 2002 and ...