Bailiffs play their role as executive agents of the judicial system and have a significant impact on achieving criminal justice and bringing the criminal system closer to the ideals of justice and efficiency. Justice officers are of particular importance due to the sensitive duties assigned to them. For this reason, the legislator has addressed the issue of bailiffs and their duties during the preliminary discussions of the law of procedure of public and revolutionary courts as well as the new law of criminal procedure. By separating the crimes into visible and invisible and considering the importance of the crime scene in visible crimes and stating the special features of invisible crimes, the legislator has granted relatively broad powers to the officers in dealing with crimes, in order to identify the criminals and accordingly It should be done to create public security in the community, because it is necessary to deal with those who violate the rights of individuals and society, to have the authority to deal with them. The duties and powers of the judicial officers are considered in intangible crimes. Intangible crimes, unlike visible crimes, are crimes that have passed a conventional period of time since they occurred, and the law enforcement officers were not there at the time of the crime, and the collection of evidence requires further research and investigation.