Ohio Rev. Code Ann. § 4734.48
(A) For purposes of enforcing this chapter, the state chiropractic board or any of its members, the board's executive director, and any person authorized by the board to serve as the executive director's representative may do any of the following:
(B) Any process, paper, or other document served under this chapter by the board, a board member, the executive director, or an authorized representative of the executive director may be served by personal service, residence service, or certified mail. Service may be made at the intended recipient's usual place of business. If attempts at service by personal service, residence service, or certified mail are unsuccessful, service may be made as follows: