The national criminal law reform, marked by the enactment of Law Number 1 of 2023 in Criminal Code, brings fundamental changes to Indonesia's criminal justice system, including in the legal aspects of investigation procedures. Previously regulated separately in the Criminal Procedure Code, investigations are now addressed in the new Criminal Code through several provisions governing the early stages of criminal law enforcement. This study aims to examine the legal normative changes related to investigations, analyze the differences between the old and new Criminal Code provisions, and assess their implications for Indonesia's criminal justice system. The research method used is normative legal research with legislative and comparative law approaches. The findings indicate that the new Criminal Code introduces a fresh perspective on the investigator's role, the initiation of prosecution, and the reinforcement of restorative justice principles. However, overlapping norms between the Criminal Code and the Criminal Procedure Code remain a serious issue that must be addressed through more comprehensive criminal procedural reforms.
                        
                        
                        
                        
                            
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