Tex. Government Code § 54.976

(a) A judge may refer to a magistrate any criminal case or matter relating to a criminal case for proceedings involving:

(1) a negotiated plea of guilty or no contest and sentencing;

(2) a pretrial motion;

(3) an examining trial;

(4) a writ of habeas corpus;

(5) a bond forfeiture suit;

(6) issuance of search warrants;

(7) setting, setting conditions, modifying, revoking, and surrendering of bonds, including surety bonds;

(8) arraignment of defendants;

(9) a motion to increase or decrease a bond;

(10) a motion to revoke community supervision or to proceed to an adjudication;

(11) an issue of competency or a civil commitment under Chapter 46, 46B, or 46C, Code of Criminal Procedure, with or without a jury;

(12) a motion to modify community supervision;

(13) specialty court proceedings, including drug court proceedings, veterans treatment court proceedings, and driving while intoxicated court proceedings;

(14) an expunction or a petition for nondisclosure;

(15) an occupational driver's license;

(16) a waiver of extradition;

(17) the issuance of subpoenas and orders requiring the production of medical records, including records relating to mental health or substance abuse treatment; and

(18) any other matter the judge considers necessary and proper.

(b) A magistrate may select a jury. A magistrate may not preside over a contested criminal trial on the merits, regardless of whether the trial is before a jury.

(c) A judge may refer to a magistrate any proceeding involving an application for a protective order under Title 4, Family Code, or Section 17.292, Code of Criminal Procedure.

(d) A judge may refer to a magistrate proceedings involving a grand jury, including issuance of grand jury subpoenas, receipt of grand jury reports on behalf of a district judge, the granting of a grand jury request to recess, motions to compel testimony, and discharge of a grand jury at the end of a term. A magistrate may not impanel a grand jury.