The implementation of common law principles is the necessary element to implement the criminal justice system, and government support helps in this regard. This aspect requires the intention of policymakers and current literature. Hence, the present article examines the impact of common law principles, such as the presumption of innocence and castle doctrine on the criminal justice system in the Kurdish region. The article also investigates the moderating impact of government support among the presumption of innocence, castle doctrine and the criminal justice system in the Kurdish region. The study used survey questionnaires to gather primary data from the selected respondents. The article also employed the smart-PLS to check the correlation among items and variables and the association among the constructs. The outcomes indicated that the presumption of innocence and castle doctrine have a positive linkage with the criminal justice system in the Kurdish region. The outcomes also exposed that the government support significantly moderates among presumption of innocence, castle doctrine and the criminal justice system in the Kurdish region. The study guides the policymakers in making policies related to develop and implement the criminal justice system by implementing common law principles.