Research On The Use Of Lie Detection In Criminal Procedure

We have been using lie detection for over 30 years in China,even if it is blank at the legislative level.Reply of the People’s Procuratorate had raised one time in the last century.It is nothing new that the judiciary are accustomed to using lie detection as evidence in criminal trial,though it is partly forbidden.The main reason why it leads some misunderstanding is that experts from all parts of the world couldn’t reach a consensus on the evidence ability of lie detection.Scientists devote to make it more accurate,meanwhile,jurists want the conclusions more persuasive.They are absolutely working on different fields.That’s the reason why they can’t communicate with each other.And that’s why I wrote this thesis.Before everything,we need to know that lie detection and torture are totally different.Only by this can we analysis lie detection’s evidence ability objectively.In order to lay the root for discussion,this thesis introduces the theory and working processes of lie detection.I’ve done my best to make it simple and understandable.This thesis explains the accuracy and relevance of lie detection to break down the obstacle of communication between scientists and jurists.I found that lie detection was accurate enough,and the harm from error conclusions can be reduced by law.Based on these,this thesis believes that lie detection can possess the ability of evidence.On the other hand,we have to admit that there’re some essential limitations of lie detection.Considering the bias in people was very deep,and the lack of expert and instruments,this thesis should hold a conservative attitude.We could allow part of the conclusions-“PASS” conclusion – to be used in criminal procedure as expert opinion.And still,we must draw a line for it and use it in due process.This action not only to protect the rights of defendant,but also to exploit the advantages of lie detection to the full.