In the early 20th century, researchers made a thrilling new claim: they could tell whether someone was lying by using a machine. Popularly known as the “lie detector,” the device was extolled as an infallible crime-fighting tool. Instead, the lie detector became an apparatus of fear and intimidation. "The Lie Detector" is a tale of good intentions, twisted morals and unintended consequences. “The Lie Detector” premieres TONIGHT at 9/8c on PBS: https://to.pbs.org/3VHP0Y1 | American Experience | P