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- [Narrator] Youve probably seen this device before. This is a polygraph which is more popularly known as a lie detector. But just how often it can catch you in a lie is debatable. (lively music) Thousands of polygraphs are given each year in the U.S. alone for everything from government clearance screenings to witness verification. And the power of these machines results are not taken lightly. People have reportedly lost their jobs and reputations over a failed exam. But how exactly does this machine work? And is it really as accurate as polygraph examiners claim? To find out we decided to put the polygraph to the test ourselves. - Do you understand Ill only ask you the questions that we discussed. - Yes. - [Narrator] Polygraph results havent been accepted in most state courts since 1923 mainly because-- - The scientific research suggests that the polygraph has docHub scientific problems. That is, it may not give us the level of accuracy, specificity, and sensitivity that we