Tex. Code of Criminal Procedure § 25

A person brought into this State by, or after waiver of, extradition based on a criminal charge shall not be subject to service of personal process in civil actions arising out of the same facts as the criminal proceeding to answer which he is being or has been returned, until he has been convicted in the criminal proceeding, or if acquitted, until he has had reasonable opportunity to return to the State from which he was extradited.

Sec. 25a. WRITTEN WAIVER OF EXTRADITION PROCEEDINGS. (a) Any person arrested in this State charged with having committed any crime in another State or alleged to have escaped from confinement, or broken the terms of his bail, probation, or parole may waive the issuance and service of the warrant provided for in Sections 7 and 8 and all other procedure incidental to extradition proceedings, by executing or subscribing in the presence of a judge or any court of record within this State, or in the presence of a justice of the peace serving a precinct that is located in a county bordering another state, a writing which states that the arrested person consents to return to the demanding State; provided, however, that before such waiver shall be executed or subscribed by such person the judge or justice of the peace shall inform such person of his:

(1) right to the issuance and service of a warrant of extradition; and

(2) right to obtain a writ of habeas corpus as provided for in Section 10.

If and when such consent has been duly executed it shall forthwith be forwarded to the office of the Governor of this State and filed therein. The judge or justice of the peace shall direct the officer having such person in custody to deliver forthwith such person to the duly accredited agent or agents of the demanding State, and shall deliver or cause to be delivered to such agent or agents a copy of such consent; provided, however, that nothing in this section shall be deemed to limit the rights of the accused person to return voluntarily and without formality to the demanding State, nor shall this waiver procedure be deemed to be an exclusive procedure or to limit the powers, rights or duties of the officers of the demanding State or of this State.

(b) Before a justice of the peace who is not an attorney may perform a duty or function permitted by Subsection (a), the justice must take, through the Texas Justice Court Training Center, a training course that focuses on extradition law. The center shall develop a course to satisfy the requirements of this subsection.

(c) Each justice of the peace who performs a duty or function permitted by Subsection (a) shall ensure that the applicable proceeding is transcribed or videotaped and that the record of the proceeding is retained in the records of the court for at least 270 days.

Sec. 25b. NON-WAIVER BY THIS STATE. Nothing in this Act contained shall be deemed to constitute a waiver by this State of its right, power or privilege to try such demanded person for crime committed within this State, or of its right, power or privilege to regain custody of such person by extradition proceedings or otherwise for the purpose of trial, sentence or punishment for any crime committed within this State, nor shall any proceedings had under this Article which result, or fail to result in, extradition to be deemed a waiver by this State of any of its rights, privileges or jurisdiction in any way whatsoever.