Based on the analysis of current legal acts and scientific literature, the article examines the issues related to ensuring security during covert investigative (detective) actions with the use of special technical means for covert obtaining of information. At present, these issues are in demand in the context of combating encroachments on the territorial integrity or territorial inviolability of the state, in particular, those related to the full-scale invasion of the Russian Federation into the territory of our country, the number of which has been increasing in recent years. In legislative and departmental regulations and special literature, scholars and practitioners have paid sufficient attention to the issues of legislative regulation of the organisation and use of special technical means in the course of covert investigative (detective) actions.
 Thus, regulatory documents and technical support for covert investigative (detective) actions conducted with the use of special technical means do not fully meet the current operational tasks of the state law enforcement agencies. Therefore, the issue of further development and harmonisation of legislative and departmental acts, improvement and introduction of the latest technologies and modern equipment in the course of operational search, counterintelligence and investigative activities is relevant.
 In the period of transformation processes which are taking place and changing the state and legal reality of the European Community countries, which Ukraine, in particular, is trying to join, an important issue is to ensure democratic and humane principles of the State’s functioning.
 The scientific novelty of the article is the actualisation of the problems associated with the use of special technical means of obtaining information and the introduction of the author’s system of their classification in the course of covert investigative (detective) actions.
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