Any party desiring the Board to issue a subpoena shall make application, stating the substance of the testimony expected of the witness or the relevancy of the evidence to be produced. If the testimony or evidence appears to the Board to be material and necessary, a subpoena shall be supplied. The affixing of the seal of the Board and the signature of the Chairman, Secretary, Executive Director, shall be sufficient attestation of the same. The party applying for the subpoena shall pay for service of the subpoena. A party is considered served at the time of personal service or mailing of the document by certified mail that is addressed to the person's last known address of record on file with the Board.
Ariz. Admin. Code § R4-30-122