The Texas Highway Patrol is a division of the Texas Department of Public Safety and is the largest state-level law enforcement agency in the U.S. state of Texas. The patrol's primary duties are enforcement of state traffic laws and commercial vehicle regulation, but it is a fully empowered police agency with authority to enforce criminal law anywhere in the state. Highway patrol troopers are also responsible for patrolling the state Capitol Complex in Austin and providing security to the governor. The current Chief is Lieutenant Colonel Dwight Mathis.

The Texas Ranger Division, also known as the Texas Rangers and also known as Diablos Tejanos, is an investigative law enforcement agency with statewide jurisdiction in the U.S. state of Texas. It is based in the capital city Austin. In the time since its creation, the Texas Rangers have investigated crimes ranging from murder to political corruption, acted in riot control and as detectives, protected the governor of Texas, tracked down fugitives, served as a security force at important state locations, including the Alamo, and functioned as a paramilitary force at the service of both the Republic (1836–1846) and the State of Texas.