Ohio Revised Code Title XXIII. Courts Common Pleas § 2317.01

All persons are competent witnesses except those of unsound mind and children under ten years of age who appear incapable of receiving just impressions of the facts and transactions respecting which they are examined, or of relating them truly.

In a hearing in an abuse, neglect, or dependency case, any examination made by the court to determine whether a child is a competent witness shall be conducted by the court in an office or room other than a courtroom or hearing room, shall be conducted in the presence of only those individuals considered necessary by the court for the conduct of the examination or the well-being of the child, and shall be conducted with a court reporter present. The court may allow the prosecutor, guardian ad litem, or attorney for any party to submit questions for use by the court in determining whether the child is a competent witness.