The rules and regulations shall exempt local law enforcement agencies, within a single county, engaged in the transportation of inmates or prisoners when those agencies maintain other motor vehicle operations records which furnish hours of service information on drivers which are in substantial compliance with the rules and regulations. This exemption does not apply to any local law enforcement agency engaged in the transportation of inmates or prisoners outside the county in which the agency is located, if that agency would otherwise be required, by existing law, to maintain driving logs.
Ca. Veh. Code § 34501