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Does lie detector always give 100 percent correct output whether a person in lying or not?
Wiki User
∙ 12y ago
It depends on how it is designed.But most of them are generally not accurate.
For example one such lie detector works on the principle of conductivity of our body.Generally resistance of our body is very high.When we lie we swet(may not be externally but surely our glands swet).Since water conducts electricity the resistivity decreases and so lie is detected.
But this is not always true.resistivity of people vary and so it cannot give accurate results always.
In the same way each method has its own limitations.
Wiki User
∙ 12y ago
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