Abstract: The criminal procedural status of a participant in criminal proceedings is of particular importance in the implementation of his criminal procedural functions during the investigation of a criminal case. In the article, the author presents the characteristics of the criminal procedural status of a person who committed a socially dangerous act in a state of insanity and a person whose mental disorder occurred after the commission of a crime. The procedural rights, duties and legal responsibility of a key participant in the proceedings on the use of compulsory medical measures are considered. The procedural rights of this participant in criminal procedural legal relations are classified depending on the implementation of a specific function during the investigation of a criminal case.

The author draws attention to the specifics of the content of the procedural status of a person in respect of whom proceedings are being conducted on the application of compulsory medical measures, and argues that such elements as procedural duties and legal responsibility of a participant in criminal procedural legal relations are not included in the criminal procedural status of a person suffering from a mental disorder. It is noted that the problem of balancing the rights and obligations of participants in the criminal process is emerging in this regard. The author suggests filling this gap with the duties of the legal representative of the person against whom the proceedings on the application of compulsory medical measures are being conducted.