Ohio Rev. Code § 5593.07
No person while in the employ of or holding any official relation to any person, firm, or corporation selling or furnishing any materials entering into the construction, improvement, repair, or maintenance of any bridge constructed or acquired by the county or city bridge commission, or who is pecuniarily interested therein as a stockholder or otherwise shall be a member of the county or city bridge commission. No such commission shall appoint any person as engineer, superintendent, or foreman sustaining such relation to such person, firm, or corporation. No such engineer, superintendent, or foreman shall thereafter become in any way connected with or interested in any such person, firm, or corporation while in the employ of such commission.
R.C. §5593.07