Why don't they just use the lie detector in crime?
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Why don't they just use a lie detector right away to know if a person really did a crime or to prove that he is guilty instead of having court sessions blabla?
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Answer:
THey aren't totally reliable and the results aren't admissible in court. If the results aren't admissible they don't want to taint any other evidence.
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Other answers
Because lie detector tests are worthless. I've taken several - never been honest when taking one and I've never failed one. If you believe you can trick the machine, then you can.
Roger Humperdink
Because polygraph exams are far from perfect. There are lots of known issues with them and the results cannot be considered evidence in a trial.
Otto Maddox
because they're not 100% accurate
Jonah
Well I have never taken a lie detector test before but I'm sure I'd fail even if telling the truth. I have a guilty conscience. I feel like I did everything. I cannot make eye contact while being questioned. No matter what it's about. I believe the lie detector detects nervousness or something like that so it wouldn't be 100% accurate and fair.
Chuck
Because you have people like me who can cheat at them. Its not hard and it's not a required test you have to give approval of it. I can make one think I'm lying when I tell the truth and all I do is control my heart rate. I can make it beet so fast it's not worth trying to give me the test.
Sombody
Because so-called "Lie detectors", technically called Polygraphs, are voodoo science of no probative value whatsoever. Their "accuracy" is little better than a coin toss. Richard
rickinnocal
Lie detectors are no where near 100% accurate that is why they are rarely even used in the court system
Tyler Durden
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