In all societies, people look for shared substantive norms to resolve problems rather than to resort to legal norms, whether or not there is also a strong formal system of law. The operations of both formal and informal justice systems should ideally be complementary. In the mountains of Cordillera, the Kalinga “Bodong” institution governs the lives of the Kalinga ethno linguistic group. This paper determined the agreement on the integration of Kalinga indigenous laws in the implementation of modern criminal law in the City of Tabuk, Kalinga. The study was conducted among the Personnel of the Philippine National Police stationed in Tabuk City during the period 2011-2012. Descriptive Statistics were used to analyze the research data. Interviews were also conducted to validate the data collected. The study revealed that the PNP Personnel strongly agreed on the integration of Kalinga indigenous law in the implementation of modern criminal law in Tabuk City but there are still problems that must be resolved in order to attain full integration. Based on the results of the study, it is recommended that some provisions should be amended to become relevant and complementary with the provisions of the laws of the land.