Ohio Rev. Code § 3309.155
The school employees retirement system shall make no investments through, purchases from, or otherwise do any business with any individual who is, or any partnership, association, or corporation that is owned or controlled by, a person who within the preceding three years was employed by, a board member of, or an officer of the system, or in which a person who within the preceding three years was employed by, a board member of, or an officer of the system holds a fiduciary, administrative, supervisory or trust position, or any other position in which such person would be involved, on behalf of his employer, in decisions or recommendations affecting the investment policy of the school employees retirement system, and in which such person would benefit by any monetary gain.
R.C. §3309.155