Ohio Rev. Code § 1531.14
Any person regularly employed by the division of wildlife for the purpose of conducting research and investigation of game or fish or their habitat conditions or engaged in restocking game or fish or in any type of work involved in or incident to game or fish restoration projects or in the enforcement of laws or division rules relating to game or fish, or in the enforcement of section 1531.29 or 3767.32 of the Revised Code, other laws prohibiting the dumping of refuse in or along streams, or watercraft laws, while in the normal, lawful, and peaceful pursuit of such investigation, work, or enforcement may enter upon, cross over, be upon, and remain upon privately owned lands for such purposes, and shall not be subject to arrest for trespass while so engaged or for such cause thereafter.
Any such person, upon demand, shall identify himself to the owner, tenant, or manager of such privately owned lands by means of a badge or card bearing his name and certifying his employment by the division.
R.C. §1531.14