Because our phones can map our faces (FaceID) and track our heart rates (via smartwatches), it feels entirely plausible to the average user that a screen could detect a lie.

To put it simply: Current smartphone hardware cannot detect physiological changes through a screen well enough to perform a legitimate polygraph test. Lie Detector Fingerprint Scan - Apps on Google Play

"It’s a parlor trick. A real polygraph measures thoracic respiration, abdominal respiration, cardiovascular activity, and GSR. A phone sensor measures one of those things poorly. The 'exclusive' part is marketing. However... if you tell someone their fingerprint is being tracked, 70% of people will confess just to avoid the digital shame. If you want to catch a liar, just watch their face. Don't give malware your biometrics."

Lie Detector — бесплатно скачайте и установите в Windows

The allure of these tools lies in the word exclusive . It implies advanced, proprietary software capable of turning everyday consumer tech into a sophisticated piece of forensic equipment. The Reality Check: Can a Touchscreen Detect Lies?

(often in a designated scanner area). Ask a question or tell a story. Receive a "Truth" or "Lie" result within seconds.