2023 Texas Statutes › Code of Criminal Procedure › Title 1 - Code of Criminal Procedure › Chapter 51 - Fugitives From Justice › Article 51.14. Interstate Agreement on Detainers › Article III.

(a) Whenever a person has entered upon a term of imprisonment in a penal or correctional institution of a party state, and whenever during the continuance of the term of imprisonment there is pending in any other party state any untried indictment, information, or complaint on the basis of which a detainer has been lodged against the prisoner, he shall be brought to trial within 180 days after he shall have caused to be delivered to the prosecuting officer and the appropriate court of the prosecuting officer's jurisdiction written notice of the place of his imprisonment and his request for a final disposition to be made of the indictment, information, or complaint;  provided that for good cause shown in open court, the prisoner or his counsel being present, the court having jurisdiction of the matter may grant any necessary or reasonable continuance.  The request of the prisoner shall be accompanied by a certificate of the appropriate official having custody of the prisoner, stating the term of commitment under which the prisoner is being held, the time already served, the time remaining to be served on the sentence, the amount of good time earned, the time of parole eligibility of the prisoner, and any decision of the state parole agency relating to the prisoner.
(b) The written notice and request for final disposition referred to in Paragraph (a) hereof shall be given or sent by the prisoner to the warden, commissioner of corrections, or other official having custody of him, who shall promptly forward it together with the certificate to the appropriate prosecuting official and court by registered or certified mail, return receipt requested.
(c) The warden, commissioner of corrections, or other official having custody of the prisoner shall promptly inform him of the source and contents of any detainer lodged against him and shall also inform him of his right to make a request for final disposition of the indictment, information, or complaint on which the detainer is based.
(d) Any request for final disposition made by a prisoner pursuant to Paragraph (a) hereof shall operate as a request for final disposition of all untried indictments, informations, or complaints on the basis of which detainers have been lodged against the prisoner from the state to whose prosecuting official the request for final disposition is specifically directed.  The warden, commissioner of corrections, or other official having custody of the prisoner shall forthwith notify all appropriate prosecuting officers and courts in the several jurisdictions within the state to which the prisoner's request for final disposition is being sent of the proceeding being initiated by the prisoner.  Any notification sent pursuant to this paragraph shall be accompanied by copies of the prisoner's written notice, request, and the certificate.  If trial is not had on any indictment, information, or complaint contemplated hereby prior to the return of the prisoner to the original place of imprisonment, such indictment, information, or complaint shall not be of any further force or effect, and the court shall enter an order dismissing the same with prejudice.
(e) Any request for final disposition made by a prisoner pursuant to Paragraph (a) hereof shall also be deemed to be a waiver of extradition with respect to any charge or proceeding contemplated thereby or included therein by reason of Paragraph (d) hereof, and a waiver of extradition to the receiving state to serve any sentence there imposed upon him after completion of his term of imprisonment in the sending state.  The request for final disposition shall also constitute a consent by the prisoner to the production of his body in any court where his presence may be required in order to effectuate the purposes of this agreement and a further consent voluntarily to be returned to the original place of imprisonment in accordance with the provisions of this agreement.  Nothing in this paragraph shall prevent the imposition of a concurrent sentence if otherwise permitted by law.
(f) Escape from custody by the prisoner subsequent to his execution of the request for final disposition referred to in Paragraph (a) hereof shall void the request.