Police are an institution that serves primarily citizens in a way to address the various issues that arise in society. It is considered that citizens do not always have sufficient insight into the complexity of police affairs, so there is continual misunderstanding in their relationship, which results in a multitude of complaints about the work and the police's handling. Although the police are a social institution that serves the society in many ways and have several purposes, the role of the police in the criminal justice system is crucial for understanding the police's functioning at all. The police's capacity to apply force to society is its law enforcement function. In addition to justifying the use of force, there are two other reasons why it is important to understand the police as an integral component of the criminal justice system. First, the perception of the police as a bearer of the fight against crime is common, and the second is that criminal proceedings begin precisely on the basis of police activities. One of the reasons why citizens listen to police decisions and obey them is the fact that otherwise they may be exposed to criminal prosecution.