Why don't they use lie detector machines in murder cases where there is a fairly obvious suspect?
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Why don't they use lie detector machines in murder cases where there is a fairly obvious suspect?
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I mean to prove the machine wrong would be very hard wouldn't it?
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Artman
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Simply becuase there is NO lie detectors. As a matter of fact it's not even called lie detector, it's called "polygraph".
The polygraph can't detect if you lie or not, it only detects if you get nervous or not. But you can get nervous because you being falsely acused of a crime; so the machine can't tell if you are scared, upset, sick or lying. Also many guilty people can pass the test. So the results are not reliable, that's why it's illegal in court.
The police know the machine doesn't work but they use it as a scare tactic to trick you into confessing. Police is even allowed to lie and tell you that you didn't pass the test even if you did.
EDIT
By the way, I know that in TV shows they sell the machine as 100% foolproof but that's only TV stuff and 100% fake. |
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Cooper
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It is possible to get pass a lie detector. There are professional liars, and its not always right. |
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marcrau
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The machine is not a very reliable measure of truth or lies. It compares your physiological responses (like heart rate or blood pressure) between benchmark "truthful" answers versus "false" answers. However, it doesn't distinguish between emotional responses that read "false" and emotional responses due to any other reason. Thus, someone's heart rate could spike for a completely different reason other than a lie and the machine would not know the difference. |
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rickinnocal
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Because polygraphs - "Lie detectors" - are voodoo science of absolutely no valid use whatsoever.
Their "results" are totally unreliable, which is why no court in any developed country will even consider anything that comes from a "Lie Detector".
Richard |
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Jade
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i don't know but i think they want to have evidence and it might be something to do with the fact that the machine isn't 100% accurate |
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joe m
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it been proven it can be beat many times that's why its not admissible in court
get out of the cave and look at the world sometime you might like what you find |
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