Ohio Rev. Code § 101.44: Testimony before committee not to be used in criminal prosecution of witness - exception.

Except a person who, in writing, requests permission to appear before a committee or subcommittee of the general assembly, or of either house thereof, or who, in writing, waives the rights, privileges, and immunities granted by this section, the testimony of a witness examined before a committee or subcommittee shall not be used as evidence in a criminal proceeding against such witness. This section does not exempt a witness from the penalties for perjury.