Art. 24.01. ISSUANCE OF SUBPOENAS    

(1) before a court to testify in a criminal action at a specified term of the court or on a specified day; or

(2) on a specified day:

(A) before an examining court;

(B) at a coroner's inquest;

(C) before a grand jury;

(D) at a habeas corpus hearing; or

(E) in any other proceeding in which the person's testimony may be required in accordance with this code.

(b) The person named in the subpoena to summon the person whose appearance is sought must be:

(1) a peace officer; or

(2) a least 18 years old and, at the time the subpoena is issued, not a participant in the proceeding for which the appearance is sought.

(c) A person who is not a peace officer may not be compelled to accept the duty to execute a subpoena, but if he agrees in writing to accept that duty and neglects or refuses to serve or return the subpoena, he may be punished in accordance with Article 2.16 of this code.

(d) A court or clerk issuing a subpoena shall sign the subpoena and indicate on it the date it was issued, but the subpoena need not be under seal.