When a person lies, the graph deviates from the ‘normal’ shape in one or more of the body functions. Such changes were believed to occur due to the emotional response to telling a lie.

The Department of Homeland Security has started giving employees lie detector tests to find out who is leaking details about upcoming immigration raids. The polygraph tests have been taking place ...

The number of lie detector tests being used on sex offenders in England and Wales has almost tripled in the last three years, leading to fears that victims’ safety is being put at risk.. The ...