Okla. Admin. Code § 380:70-3-11
Any denial of an issuance of a Certificate of Operation, Temporary Certificate of Operation, or any order issued by the Commissioner, or any Red Tag notification may be appealed and the appropriate party(ies) shall be afforded the opportunity for a hearing pursuant to the provisions of the Administrative Procedures Act, if written request is received by the Department within fifteen days (15) of the denial letter or notification. Any Special Inspector or Certificate Inspector who has denied the issuance of a Certificate of Operation or Temporary Certificate of Operation, or who has issued a Red Tag, the denial or issuance of such having been appealed, shall be required to attend the hearing and provide testimony regarding such denial or issuance and shall be required to produce all documents relevant to such denial or issuance.
Okla. Admin. Code § 380:70-3-11