Our expert says:
Fine. What Lie Detectors try to do, is to identify changes in breathing, pulse rate, sweatiness, that indicate someone is nervous when answering a question, and they assume that if you are more nervous answering certain questions, then those answers must be lies. Experiences liars can beat the system ( as can habitual liars who aren't in the least disturbed by lying ) --- and ordinary people who are nervous about the most relevant questions may get anxious even though telling the absolute truth. I wonder whether she would have agreed to take the test. The way some folks use the test is to challenge someone to take a lie detector test, and if the other person believes it is an accurate test, they may confess rather than go through with testing
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