The decision of non-investigation in the face of the principle of the necessity of a public action

The subject of the thesis is the decision of the Prosecutor's Office, which has been recently regulated in Turkish criminal procedure law system, the decision of non-investigation. It is necessary to determine the place of in the Turkish criminal procedure and legal character of the decision of non-investigation, which is a new regulation, to reveal the purpose of the regulation and the changes it has brought to in Turkish legal system. The study basically consists of three chapters. The first chapter of the study has been devoted to the examination of the principle of the necessity of public action and compliance with the interest as the principles are related to the the decision of non-investigation. In the second chapter of the study, the legal character of the decision of non-investigation, its place in the criminal procedure, its conditions and results, its relationship with similar legal regulations and its connection with basic rights and freedoms has been examined. Finally, the supervision possibilities that can be applied against the decision of non-investigation have been put forward.