The role of the Indonesian National Police forensic Laboratory has contributed to legal certainty, but at present it is not yet based on the value of justice, influencing factors include understanding the substance of letters and expert statements in article 184 (1) of the Criminal Procedure Code is multi-interpretation, the base of the Indonesian National Police forensic Laboratory is still limited , the empowerment of the Indonesian National Police forensic Laboratory has not been maximized so that several problems arise, for example there are investigators not familiar with, understand the empowerment of the Indonesian National Police forensic Laboratory, technical issues and other problems. Formulation of the problem: (1) Why is the role of the Indonesian National Police forensic laboratory in the criminal justice system currently not based on the value of justice (2) What are the weaknesses that arise in the implementation of the role of the Indonesian National Police forensic Laboratory in the criminal justice system not based on the value of justice and (3) How is the reconstruction of the role of the Indonesian National Police Forensic Laboratory in the criminal justice system based on justice values with an empirical juridical research approach. The results of this study are the legal reconstruction of the substance of substance in Article 184 (1) of Law No.8 of 1981 concerning Criminal Procedure Law, the legal evidence being 6 (six) items, namely witness statements, expert statements, letters, instructions statement of the defendant and the results of the forensic Laboratory examination; reconstruction of structural elements, namely in each Polda and large cities, the Indonesian National Police forensic Laboratory was built and reconstruction of the cultural element, which was to empower the forensic Laboratory with the strategy of the results of the forensic Laboratory examination included in item 6 (six) in Evidence, Article 184 ( 1) The Criminal Procedure Code is expected that the public, legal practitioners and academics will change their mindset into a new paradigm and expect the state to facilitate the role of an ideal forensic laboratory so that in the end its role is based on the value of justice.