Ohio Rev. Code § 145.112
The public employees retirement system shall make no investments through or 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 public employees retirement system, or in which a person who within the preceding three years was employed by, a board member of, or an officer 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 public employees retirement system, and in which such person would benefit by any monetary gain.
R.C. §145.112