Forensic psychophysiological expertise with application of polygraph

The notions of psychophysiological investigation (PPI) and psychophysiological examination with application of polygraph are characterized. The history of the method for more than 100 years, the aims of the examination are described. Effective use of the polygraph in criminal investigations is illustrated. The absence of methodological regulations and difficulties in training specialists hinder wide introduction of polygraphs into practice. How to get over these difficulties is shown.