Ohio Rev. Code § 2938.08: Defendant presumed innocent.

A defendant in a criminal action is presumed to be innocent until he is proved guilty of the offense charged, and in case of a reasonable doubt whether his guilt is satisfactorily shown, he shall be acquitted. The presumption of innocence places upon the state (or the municipality) the burden of proving him guilty beyond a reasonable doubt.

In charging a jury the trial court shall state the meaning of the presumption of innocence and of reasonable doubt in each case.