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How many have you cheated?

Actually we had A psychology class in college where they showed how they work and all the false assumptions they make about them. Our teacher had videos of people who essentially passed the tests even though they said they were women instead of men, etc. They make the assumption that nervousness is related to being dishonest which varies greatly among the population.

When they hooked me up I basically pegged the thing on every question he asked, true or not.

They can be used as investigative tools since they are just another intimidating interrogation technique which some people respond to and other do not. But they prove nothing. There is a reason they are not allowed in court.