The exercise of authority by private security officers causes many controversies both in the domestic security system and abroad. Although the system of private security is not a new institute, being already known in almost all countries, the legal regulation has not yet been completed. The paper examines the legal regulation and the procedure for the exercise of the authority of crime scene protection. The introduction provides a brief comparative legal analysis of the legal systems of the neighboring countries and a number of other European countries. In the second part, the analysis of the legal norms leads to the basic principles for the enforcement of the authority by private security officers. The third part analyzes the power relating to prohibition of entry and stay in the protected facility as a potential authority that can be used as a basis for crime scene protection. In the fourth part, from the available literature and from the practical procedure, the actions of the private security officer during the crime scene protection in the situation when there is no explicit legal norm are shaped. It is concluded that from the aspect of legal regulation and enforcement of this authority, there are two types of legal systems, that the basis and limits of enforcement of this authority can be in criminal and misdemeanor legislation, that the tactics and manner of exercise correspond to these applied by police officers and that this power must find its place de lege ferenda in the systemic law pertaining to this area.