Polygraph tests can supposedly detect when a person is lying. But how can a machine do that, and can we really trust the results they provide?

Career Do Lie Detector Tests Really Work? The modern polygraph test is widely used, but is it accurate? Posted January 14, 2020 | Reviewed by Abigail Fagan ...

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 ...