Amends TCA Title 5; Title 6; Title 38 and Title 68.

Tennessee HB1870 requires individuals, including the commissioner of commerce and insurance, the commissioner's deputies, municipal fire investigators, and salaried county fire investigators, to obtain certification from the peace officer standards and training commission in order to exercise police powers, such as making arrests, in cases related to arson or suspected arson. This bill impacts the authority and operational procedures of fire investigators and certain state officials involved in arson investigations. Key provisions include the establishment of certification requirements for these roles to ensure they are authorized to perform law enforcement functions in arson-related cases.