Failing Driver's Test Prank

SOLVED: Polygraph lie-detector machines are commonly used in criminal investigations. The device measures nervous excitement, operating on the idea that if a person is telling the truth they will remain calm.The American Polygraph Association claims that polygraphs accurately identify liars 90% of the time. In other words, if a person lied the test results will be positive 90% of the time.Although the polygraph test is good at identifying liars, there is a 50% chance that the polygraph test will

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