Ohio Rev. Code § 2945.36: For what cause jury may be discharged.

The trial court may discharge a jury without prejudice to the prosecution:

(A) For the sickness or corruption of a juror or other accident or calamity;

(B) Because there is no probability of such jurors agreeing;

(C) If it appears after the jury has been sworn that one of the jurors is a witness in the case;

(D) By the consent of the prosecuting attorney and the defendant.

The reason for such discharge shall be entered on the journal.