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Well the "government" isn't a single entity. The parts of the government that use lie detectors don't believe that they detect lies, they believe that they can be used to coerce or scare confessions out of people. The FBI know a lie detector can't tell if you're lying, but they make use of the...

Lie Detectors do not detect lies. They are actually polygraphs, which record various physical measurements (such as heart rate and sweat). All that a "lie detector" could actually measure, if that, would be your nervousness, which could easily occur when one is telling the truth. And it's not...