The Study On Evidential Value Of Polygraph Conclusion In Criminal Procedure

There was a drastic argument about polygraph technology (In criminal procedure, it is called psycho-physiological detection of criminal deception techniques shorted for PDDT). Some people did not acknowledge its technological principle as well as manipulation rules and overstate its limitation, while other people considered it could substitute everything and exaggerated its efficiency.PDDT had solid basis of science principle and had formed a series of standard manipulation rules. At the same time, it had its limitation. however, this technology can bring about revolutionary advantages and changes to criminal procedure from ten respects if we treat it objectively.Now, its lawful evidence position has not been established basically in domestic. Whether it has evidence value or not depends on mainly:(1) its scientific character, function and the reliability of conclusion;(2) its degree of acceptance on value by people in china;(3) whether it violates the privilege of against self-incrimination or not;(4) whether it has evidence ability and value or not;(5) whether it accords with the general knowledge of international science and technology evidence;(6) whether it violates the rules of hearsay evidence;(7) the relation between it and the extorting a confession by torture ;(8) whether it accords with the requirement of the principle of presumption of innocence .In essence, its conclusion is a type of science and technology evidence. We should strengthen the legislative study about it from now on.