The supposed science behind polygraph tests is flawed, even proponents say it's only 90% accurate, (critics say it's far less at 70% or lower) so, at a minimum, for every 10 people that are tested 1 of them either gets accused of something they didn't do, or gets away with doing something. (or 3 out of 10 if you take a critic's side) And when it's done by Police, they are legally allowed to lie to you about your results!
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