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Criminal investigation

   Criminal science and technology with the system is complete, according to the criminal technology professional categories are divided into: Photography and video technology, the trace examination technology, instruments (including handwriting) inspection technology, the criminal physical and chemical inspection technology, forensic identification, DNA test, voiceprint identification technology, odor identification technology, psychological measurement (lie detector) technology, the human body appearance identification technology, communication technology, criminal investigation simulating painting etc..
   It is mainly the use of material transfer and exchange principle, species identification principle and the same principle found complete identification, inspection and identification of the work of the evidence. Play an irreplaceable role in the practice of criminal science and technology to determine the nature of the case, judge the case, describe the crime person's body condition, to provide evidence and materials case etc..

 The relevant classification
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