Texas Occupations Code - OCC § 601.308. Subpoena

(1) to conduct an investigation or a contested proceeding related to:

(2) for purposes of determining whether to issue, suspend, restrict, or revoke a certificate or approval under this chapter.

(1) disciplinary action by the advisory board or another licensing or regulatory agency with jurisdiction over the person subject to the subpoena;  and

(2) denial of an application for certification or approval.