Ohio Rev. Code § 956.16
The director of agriculture, the director's authorized representative, or the attorney general may require the attendance of witnesses and the production of books, records, papers, and dogs that are needed either by the director or the attorney general or by any party to a hearing before the director and for that purpose may issue a subpoena for any witness or a subpoena duces tecum to compel the production of any books, records, papers, or dogs. The subpoena shall be served by personal service or by certified mail. If the subpoena is returned because of inability to deliver, or if no return is received within thirty days after the date of mailing, the subpoena may be served by ordinary mail. If no return of ordinary mail is received within thirty days after the date of mailing, service shall be deemed to have been made. If the subpoena is returned because of inability to deliver, the director or the attorney general may designate a person or persons to effect either personal or residence service on the witness. The person designated to effect personal or residence service under this section may be the sheriff of the county in which the witness resides or may be found or any other duly designated person. The fees and mileage of the person serving the subpoena shall be the same as those allowed by the courts of common pleas in criminal cases and shall be paid from the funds of the department of agriculture. Fees and mileage for the witness shall be the same as those allowed for witnesses by the courts of common pleas in criminal cases and, upon request of the witness following the hearing, shall be paid from the money in the high volume breeder kennel control license fund created in section 956.18 of the Revised Code.
R.C. § 956.16