Texas Natural Resources Code - NAT RES § 115.044. Service of Process

(a) In an action or proceeding that involves the enforcement of this chapter or a commission order, a Texas Ranger or agent of the commission may serve any judicial process, warrant, subpoena, or writ as directed by the court issuing the process and shall serve the process in the same manner as a peace officer.

(b) The ranger or agent may serve the process, warrant, or subpoena anywhere in this state although it may be directed to the sheriff or a constable of a particular county.

(c) The ranger or agent shall make the same return as any other officer, sign the return, and add under the name the title “State Ranger” or “Agent, Railroad Commission of Texas,” as appropriate, which is sufficient to make the writ valid if the writ is otherwise properly prepared.

(d) A Texas Ranger or agent of the commission is not entitled to a fee in addition to that person's regular compensation for a service provided under this section.