Tex. Health & Safety Code § 191.0031

The state registrar or a local registrar may not issue a certified copy of a record under this chapter to a person who has applied for the record by mail unless the person has provided notarized proof of identity in accordance with rules adopted by the executive commissioner of the Health and Human Services Commission. The rules may require the issuer of the certified copy to verify the notarization using the records of the secretary of state under Section 406.012, Government Code.