The concept, tasks, general conditions (principles) and forms of interaction between the investigator and the operational unit officer

Introduction. A well-organized interaction of the subjects of the investigation is in many ways the key to prompt and comprehensive establishment of all the circumstances to be proved and, as a result, the achievement of the goals of criminal proceedings. This topic has not been neglected by scientists, processualists and criminologists, whose works have significantly enriched the theory of these legal sciences, however, unfortunately, they have not covered all the existing problematic issues. And if the scientific community is almost unanimous on issues of interaction, then in another part of them, including of a practical nature, there remains much to discuss, and there are points of view on them that are not only contradictory, but also diametrically opposed. Materials and methods. The research is based on the analysis of texts of legal scientific literature devoted to the issues of interaction between an investigator and an employee of an operational unit, as well as modern judicial and investigative law enforcement practice and regulatory legal acts regulating this aspect of law enforcement; the methodological basis of this research is a set of methods of scientific knowledge, among which the main place is occupied by methods of information processing and logical analysis, synthesis induction, deduction, and generalization. Analysis. The vision of the concept, tasks, principles and forms of interaction between employees of the preliminary investigation bodies and employees of operational investigative units presented in the work, based on the analysis of existing points of view on the phenomenon under consideration, the regulatory legal framework and judicial investigative practice, makes it possible to approach the resolution of some of the existing problematic issues of the organization and implementation of interaction of investigative subjects during identification and investigation crimes. Results. The work, among other things, examines the legal basis of interaction with a sufficient degree of care; an employee of the investigative unit and an employee of the operational unit are considered both participants in criminal proceedings and as subjects of cooperation in the process of disclosure and investigation of a criminal offense; in the context of modern effective interaction of these subjects.