The book discusses a number of issues relevant to theory and practice related to the concept, criminal procedural competence of customs authorities as bodies of inquiry, the organization of activities of specialized inquiry units in the system of the Federal Customs Service of the Russian Federation, the specifics of evidence in criminal cases of crimes in the field of customs, application of procedural coercion measures by participants of customs authorities to participants in criminal proceedings, as well as the grounds and processes ualnym order production of bodies of inquiry urgent investigative actions by a customs criminal offenses for which a preliminary investigation is mandatory, the main directions of interaction of bodies of inquiry with investigators. The book was prepared on the basis of the current criminal and criminal procedural legislation of the Russian Federation, taking into account the prevailing judicial, prosecutorial practice, as well as the practice of investigating criminal cases in the form of an inquiry