OAC Rule 24. Closing Statement. 

At the conclusion of a hearing, a party may make a closing statement or, at the discretion of the judge, submit written documents.  Written documents may be submitted by mail or e-mail to the OAC, or by facsimile if ten pages or less.  If the judge determines that written documents may be submitted, the written documents shall be due within 15 calendar days of the hearing date, unless good cause is shown for a longer or shorter period.