Ohio Revised Code Title XXIX. Crimes Procedure § 2901.20

(A) Every act enacted on or after the effective date of this section that creates a new criminal offense shall specify the degree of mental culpability required for commission of the offense. A criminal offense for which no degree of mental culpability is specified that is enacted in an act in violation of this division is void.

(B) Division (A) of this section does not apply to the amendment of a criminal offense that existed on the effective date of this section, but it does apply to a new criminal offense added to a statute that existed on the effective date of this section.