(a) General rule. The Board may review a ruling of the administrative law judge prior to the certification of the record to the Board only in accordance with the procedures set forth in this section and §263.23.

(b) Scope of review. The Board may exercise interlocutory review of a ruling of the administrative law judge if the Board finds that:

(1) The ruling involves a controlling question of law or policy as to which substantial grounds exist for a difference of opinion;

(2) Immediate review of the ruling may materially advance the ultimate termination of the proceeding;

(3) Subsequent modification of the ruling at the conclusion of the proceeding would be an inadequate remedy; or

(4) Subsequent modification of the ruling would cause unusual delay or expense.

(c) Procedure. Any request for interlocutory review shall be filed by a party with the administrative law judge within ten days of his or her ruling and shall otherwise comply with §263.23. Any party may file a response to a request for interlocutory review in accordance with §263.23(d). Upon the expiration of the time for filing all responses, the administrative law judge shall refer the matter to the Board for final disposition.

(d) Suspension of proceeding. Neither a request for interlocutory review nor any disposition of such a request by the Board under this section suspends or stays the proceeding unless otherwise ordered by the administrative law judge or the Board.