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Can the polygraph test really spot a lie?

NPR· Oct 20, 2026· 19m 34s

From dating shows to police interrogation rooms, the polygraph test has long been marketed as a way to detect deception. But can it really? And who decided we needed a truth machine in the first place? In this episode, a Throughline listener sends us on a quest to uncover the story of the lie detector. Guests: Ken Alder, professor of history at Northwestern University and author of The Lie Detectors: The History of an American Obsession Support public media with NPR+ and enjoy perks for over 25

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Can the polygraph test really spot a lie?

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Sample transcript — click Live captions above to run Whisper on the actual audio in your browser.
  1. Welcome to the program. I'm your host.

    Welcome to the program. I'm your host.

    0:00
  2. Today we look at the major stories shaping the news cycle.

    Today we look at the major stories shaping the news cycle.

    0:04
  3. We start in Europe, where leaders met in Brussels.

    We start in Europe, where leaders met in Brussels.

    0:09
  4. The summit focused on energy policy and migration.

    The summit focused on energy policy and migration.

    0:14
  5. Reporting from the ground, our correspondent has more.

    Reporting from the ground, our correspondent has more.

    0:19
  6. Thank you. The mood here was tense but constructive.

    Thank you. The mood here was tense but constructive.

    0:24