Texas Occupations Code - OCC § 206.308. Subpoena

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

(2) for purposes of determining whether to issue, suspend, restrict, or revoke a license under this chapter;  or

(3) for purposes of determining whether to issue or deny a license under this chapter.

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

(2) denial of a license application.