Polygraph tests, or lie-detector tests as they are commonly known, do not read minds. Nor do they read lies. They rely on small but significant physiological changes to predict whether a lie has been spoken, stemming from changes in certain emotions. You would be better off, calling them "emotion-detectors". False alarms are so often, and the underlying working principles dish out so flawed results in real life, that the National Research Council of the United States National Academics, has declared it unusable for legal and security screening. This episode is based on an excerpt from Emotional Design, written by Donald Norman.

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