Ohio Const. art. I, § 10

Except in cases of impeachment, cases arising in the army and navy, or in the militia when in actual service in time of war or public danger, and cases involving offenses for which the penalty provided is less than imprisonment in the penitentiary, no person shall be held to answer for a capital, or otherwise infamous, crime, unless on presentment or indictment of a grand jury; and the number of persons necessary to constitute such grand jury and the number thereof necessary to concur in finding such indictment shall be determined by law. In any trial, in any court, the party accused shall be allowed to appear and defend in person and with counsel; to demand the nature and cause of the accusation against him, and to have a copy thereof; to meet the witnesses face to face, and to have compulsory process to procure the attendance of witnesses in his behalf, and a speedy public trial by an impartial jury of the county in which the offense is alleged to have been committed; but provision may be made by law for the taking of the deposition by the accused or by the state, to be used for or against the accused, of any witness whose attendance can not be had at the trial, always securing to the accused means and the opportunity to be present in person and with counsel at the taking of such deposition, and to examine the witness face to face as fully and in the same manner as if in court. No person shall be compelled, in any criminal case, to be a witness against himself; but his failure to testify may be considered by the court and jury and may be made the subject of comment by counsel. No person shall be twice put in jeopardy for the same offense.