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The article defines the concept of «principles of the organization and activity of an inquirer regarding the prevention of criminal offenses», systematizes them and provides a description of the principle of the rule of law as fundamental in such activity. Thus, under the principles of the organization and activity of an inquirer regarding the prevention of criminal offenses, it is proposed to understand the basic guiding principles enshrined in the Constitution of Ukraine, current legal acts, on the basis of which certain rules of behavior in the field of criminological activity are formed, which determine the effectiveness of the procedural activity of an inquirer in the prevention of criminal offenses. This activity of an inquirer is focused on the results achieved at certain stages of a pre-trial investigation. According to the results of the conducted research, the principles of the organization and activity of an inquirer regarding the prevention of criminal offenses are systematized as follows: common law - defined by criminal procedural legislation (rule of law, legality, humanism, justice); special - inherent in the criminological activity of an inquirer, determining the criteria for the effectiveness of his activity as a subject of the prevention of criminal offenses (comprehensiveness, timeliness, consistency, completeness of identification of certain circumstances that contribute to the commission of a criminal illegal act, impartiality of their investigation). It is substantiated that the principle of the rule of law should be perceived both as a universal and as an integral principle of law, which covers the following components: legality; ensuring human rights; legal certainty; justice; quick, complete and impartial investigation (this principle is fundamental in the formation and implementation of the preventive function of an inquirer and plays the role of a fundamental principle and connecting link in the system of relations between the law enforcement body and the person, as well as the principles, methods and means of inquiry bodies activity).
O.Yu. Telen (Mon,) studied this question.