The criminal justice process is a systematic mechanism through which society responds to crime while ensuring justice, fairness, and the protection of individual rights. It consists of three major stages: investigation, trial, and correction. Each stage plays a distinct role in crime control and contributes to maintaining law and order. From the perspective of social work and criminal justice, these processes are not only meant to punish offenders but also to protect victims, rehabilitate offenders, and uphold the principles of human rights and social justice. Investigation is the first and one of the most important stages of the criminal justice process. It begins when information about a crime is received by the police or other authorized agencies. The purpose of investigation is to collect evidence, identify suspects, establish facts, and determine whether a crime has been committed. A fair and professional investigation helps prevent wrongful arrests and ensures that innocent persons are not subjected to unnecessary legal action. Proper investigation also strengthens public confidence in the justice system because decisions are based on evidence rather than assumptions or prejudice. The investigation process must respect the constitutional and legal rights of individuals. The accused has the right to be informed of the charges, to remain free from torture, illegal detention, and forced confession. Victims also have the right to receive protection, information, and support throughout the investigation. Social workers may assist victims by providing emotional support, counselling, crisis intervention, and connecting them with legal and rehabilitation services. They also advocate for vulnerable groups such as children,