The pre-prosecution process often occurs, so that the case files go back and forth from investigators to the Public Prosecutor, incomplete case files will have an impact on the pre-prosecution process. The purpose of this study is to determine the return of case files by the Public Prosecutor in pre-prosecution. This type of research is normative legal research with a case approach, legislation, and analysis. The results of the study were obtained as follows, because there is no single provision that provides a limit on the number of times case files can be returned, this can be related to the legal objectives of a person's human rights, and for the sake of legal certainty for justice seekers, the return of investigation results or additional investigator results by The Public Prosecutor to investigators, must have strict limitation criteria. The consequences if the case file is not returned from the public prosecutor if within seven days the case file is not returned, the investigation case file is considered complete.

The criminal justice system is the process of enforcing material criminal law. In enforcing the criminal material law in a criminal justice system, it must be through the role of law enforcers. Law enforcement is an important part because without law enforcement, the law that has been agreed upon by the community will not be implemented. One part of the law in question is criminal procedural law. The law enforcers contained in the criminal procedural law are the Police, Advocates, Prosecutors (Public Prosecutors) and Judges. In this study, the role of law enforcers in criminal procedural law will be examined, which in this study consist of the Police, Advocates, Prosecutors (Public Prosecutors) and Judges. This research uses normative juridical research by linking the subject matter to the main topic in this study, namely the role of law enforcement factors in the practice of criminal procedural law. The results of this study will explain the role of relevant law enforcers in criminal procedural law and the role of law enforcers.

Conflict is usually related to other individuals or groups, therefore it is often called social conflict. Based on Law Number 7 of 2012 concerning Handling of Social Conflict, what is meant by Social Conflict is violent feuds and/or physical clashes between two or more community groups that take place within a certain time and have wide-reaching impacts resulting in insecurity and social disintegration thereby disrupting social stability. national and impede national development. Sociologists argue that the root of the emergence of conflict is the existence of social, economic, political relations whose roots are the struggle over sources of ownership, social status and power whose availability is very limited with unequal distribution in society. This type of research is normative legal research with a case, regulation, and analysis approach. This study aims to provide a strategy for resolving legal disputes between companies and the community through a legal sociology approach.

Abstract The police are one of the law enforcers who have a very important role in the criminal justice system in Indonesia. The role and influence of the police in the criminal justice system will be reviewed from the investigation stage to the investigation, which will then be transferred to the prosecutor's office. The Police and the Prosecutor's Office as the two pillars of law enforcement in the function of investigation and prosecution in addition to Correctional Institutions as executors of crimes under the control of the Government's power. The police can be said to be the initial pillar in the course of a criminal justice system, because the police process is the initial stage of the criminal justice system. This type of research is normative legal research with a case approach, legislation, and analysis. This research will examine the position and important role of the police in the criminal justice system in Indonesia.