Texas Government Code - GOV'T § 411.022. Authority of Officers

(a) An officer of the Texas Rangers is governed by the law regulating and defining the powers and duties of sheriffs performing similar duties, except that the officer may make arrests, execute process in a criminal case in any county and, if specially directed by the judge of a court of record, execute process in a civil case.

(b) An officer of the Texas Rangers who arrests a person charged with a criminal offense shall immediately convey the person to the proper officer of the county where the person is charged and shall obtain a receipt. The state shall pay all necessary expenses incurred under this subsection.

(c) An officer of the Texas Rangers has the authority to investigate offenses against public administration prosecuted under Subchapter B-1.  1