Why does Indian Court do not accept polygraphy and NARCO test evidence?

A significant criticism of polygraphy is that sometimes the physiological responses triggered by feelings such as anxiety and fear could be misread as those triggered by deception. Similarly, with the P300 Waves test there are inherent limitations such as the subject having had `prior exposure' to the `probes' which are used as stimuli. Furthermore, this technique has not been the focus of rigorous independent studies. The questionable scientific reliability of these techniques comes into conflict with the standard of proof `beyond reasonable doubt' which is an essential feature of criminal trials.

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