Texas Code of Criminal Procedure - CRIM P Art. 20.17. How suspect or accused questioned

(a) The grand jury, in propounding questions to the person accused or suspected, shall first state the offense with which he is suspected or accused, the county where the offense is said to have been committed and as nearly as may be, the time of commission of the offense, and shall direct the examination to the offense under investigation.

(b) Prior to any questioning of an accused or suspected person who is subpoenaed to appear before the grand jury, the accused or suspected person shall be furnished a written copy of the warnings contained in Subsection (c) of this section and shall be given a reasonable opportunity to retain counsel or apply to the court for an appointed attorney and to consult with counsel prior to appearing before the grand jury.

(c) If an accused or suspected person is subpoenaed to appear before a grand jury prior to any questions before the grand jury, the person accused or suspected shall be orally warned as follows: