The term detective activity is of a recent day in our region, although these activities were performed, through appropriate forms and ways, even in the period before this issue was regulated by law. Despite the enactment of the Law on Detective Activity there are certain regulations contained in other laws that directly or indirectly may apply to the detective activity. This paper uses content analysis methods, comparison, deduction and synthesis in order to explore and analyze problems relevant to this subject matter, i.e. regulations of criminal legislation and other laws related to or possibly related to the detective activity or to some of its aspects, with the previous emphasis on organization, entities, their authorities and way of performing the detective activity. Considering that the Law on Detective Activity contains provisions that refer to other legal acts, the rules associated with the detective activity and incorporated into other legislation are very significant, because their correct application allows for legal and professional performance of detective activities.