In terms of catching spies, polygraph tests failed spectacularly in key moments. More on that in a moment. First, consider the second Trump administration, which is leaning in on polygraphs, ...

“The polygraph has been weaponized and is being used against individuals who have never had a polygraph requirement, whether pre-employment or security, in their entire federal careers,” said Mark ...

Amit Katwala’s Tremors in the Blood charts the history of lie detectors with a series of gripping true-crime stories There is a fine topical gag in Agatha Christie’s 1925 novel The Secret of Chimneys, ...

Until recently, the most famous application of the polygraph machine in the United Kingdom was probably the Jeremy Kyle Show. Unlike in the United States, where there are an estimated three million ...

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 ...

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, ...

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 ...

Alan Teschendorf is a truth teller. As a polygraph examiner for the Illinois State Police, Teschendorf says he doesn't look for people who are lying. His goal is to find the truth. The Collinsville ...