The true history of lie detector tests

The polygraph was heralded as an infallible way to detect a criminal, but soon after, controversy arrived. Writer and director Rob Rapley joins host Krys Boyd to discuss the invention of what is known as the lie detector test, its uses and abuses, and how it’s used today. His American Experience film, “The Lie Detector,” is available on PBS streaming apps.

This episode originally aired on January 10, 2023.