Texas Transportation Code - TRANSP § 701.002. Power to Act;  Guidance

(1) must be deputized by the sheriff or a constable of the county in which the officer is employed;

(2) must give a bond and take an oath of office as other deputy sheriffs;

(3) must work under the direction of the sheriff;  and

(4) has the same right and duty as a deputy sheriff to arrest a person who violates a law.