Ohio Rev. Code § 2933.591: Giving warning of possible surveillance.

(A) No person who knows that an application for an interception warrant has been authorized or made under section 2933.53 of the Revised Code, that an interception warrant has been issued under section 2933.54 of the Revised Code, that an application for an extension of an interception warrant has been filed under section 2933.53 of the Revised Code, that an extension of an interception warrant has been ordered under that section, that an application for a grant of an oral order for an interception has been made under section 2933.57 of the Revised Code, or that oral order for an interception has been granted under section 2933.57 of the Revised Code, with purpose to obstruct, impede, or prevent the interception in question, shall give notice or attempt to give notice of the possible interception to a person.

(B) Whoever violates division (A) of this section is guilty of giving warning of possible surveillance, a felony of the third degree.