Determinants and methods of diagnosing criminal proceedings participants false testimony in Ukraine

The purpose of the article is to determine the procedural and non-procedural methods of diagnostics false testimony of criminal proceedings participants’, which can be used in the investigation in Ukraine. The authors use general and special methods that allow obtaining scientifically sound conclusions and suggestions. The dialectical method, system-structural, generalizing, logical and statistical methods were used in the study. According to the results of the study, the number of criminal offenses initiated in Ukraine in connection with the provision of false testimony by victims and witnesses is quite large. If a person is convicted based on false testimony, a new criminal trial must be ordered in connection with the newly discovered circumstances. The authors determined that procedural methods of diagnostics false testimony include investigative (search) actions and forensic examinations, and non-procedural - various types of research, in particular, the use of polygraph and physiognomic research, as well as methods of analyzing nonverbal information. Re-interrogation, additional and simultaneous interrogation of previously interrogated persons, investigative experiment are the most effective procedural means of diagnosing false testimony. Non-procedural means of diagnosing false indications require further research and scientific substantiation, including the development of a mechanism for training relevant specialists