Tex. Transportation Code § 21.152: CONDUCT OF INVESTIGATION, INQUIRY, OR HEARING.

A member of the commission, the director, or an officer or employee of the department who has been designated by the commission to hold an investigation, inquiry, or hearing may:

(1) administer an oath;

(2) certify an official act;

(3) issue a subpoena;

(4) order the attendance and testimony of a witness; or

(5) order the production of a paper, book, or document.

Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.