The book of the Russian scientist, specialist in the field of polygraph examinations deals with a whole range of problems associated with conducting polygraph examinations, from the preparation of tests, tactics of polygraph examinations, methods of analyzing results, including the method of neutralizing counteraction to polygraph examinations. In order to better understand the problem of testing, an analysis of the psychophysiological mechanisms underlying the recorded reactions is provided in an accessible form. The book is designed for cadets undergoing special training to work on a polygraph. It is also of interest to polygraph operators who already have extensive practical experience.