Based on the analysis of domestic historical experience and the current state of the legislative regulation of the involvement of a specialist to assist an investigator in investigative proceedings, as well as the survey of investigators, it is concluded that it is necessary to expand the powers of a specialist in terms of rendering assistance to an investigator during investigative actions aimed at obtaining testimony (including interrogation). In this regard, proposals to amend the wording of Articles 38 and 58 of the Criminal Procedure Code of the Russian Federation are made. The proposed changes will significantly expand the powers of a specialist in the course of all investigative actions (including verbal ones) and will correspond to the modern trends in the development of criminal proceedings, increasing its quality by attracting specific knowledge and skills from various fields of human activity.