LIE detector tests have become more and more frequent on TV – with programmes such as The Jeremy Kyle Show and Love Island making use of the devices. But how exactly do polygraph machines work? And ...

How does a lie detector work? Lie detectors work on the principle that anyone who’s lying will be nervous, and nervous people tend to produce more adrenaline, which makes their hearts beat faster, ...

The company behind the lie detector tests used on The Jeremy Kyle Show charges from £400 per polygraph examination which takes around two hours. The tests, which form a regular part of the ITV chat ...

In February of 1994, the FBI arrested Aldrich Ames, who had been a CIA employee for 31 years. Ames was arrested and charged with espionage. He was a Russian spy. For nine years, he had been passing ...

LIE detector tests have become more and more frequent on TV - with programmes such as The Jeremy Kyle Show and Love Island making use of the devices. But how exactly do polygraph machines work? And ...