Truth - how to find it from those who tell lies and make other fools

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I do think there are many methods like polygrap tesh, brain marping or hypnotism. But these all have restrictions to find out the truth from the culprit. Still most of them also need the coopertion of the pearson who had lied. They are many who get trapped or their life get spoiled only because the court had to hear lie from the witness or other party. These innocent people are unable to show their innocence as the truth is hidden. Suggestions and opinions to get these lies out.