When President Ronald Reagan’s White House threatened thousands of government officials with polygraph exams, supposedly to protect classified data (but probably also to control press leaks), his ...

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 ...

They feature frequently in real-life murder documentaries and, until 2019 when The Jeremy Kyle Show was taken off air, were a huge focal point for reality TV shows. But what does it feel like to ...

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 ...

Alex Murdaugh failed a polygraph test administered as part of the plea agreement for the disgraced former attorney’s raft of financial crimes, violating the deal, which required his truthfulness, ...