Part 2/8:
During the interview, he demonstrates a typical polygraph test scenario: selecting a card at random, then asking the subject whether they picked a specific number. While the subject is instructed to answer truthfully, the examiner watches for physiological cues that indicate deception. For example, when the subject denies selecting the card number three, the examiner notices increased breathing amplitude, slight skin conductivity rise, and blood pressure changes, all suggesting that the person is lying when affirming the choice.