34 C.F.R. § 303.446
(b) Appeal of decisions; impartial review.
(2) If there is an appeal, the lead agency must conduct an impartial review of the findings and decision appealed. The official conducting the review must—
(d) Finality of review decision. The decision made by the reviewing official is final unless a party brings a civil action under § 303.448.
(Authority: 20 U.S.C. 1415(g), 1415(h)(4), 1415(i)(1)(A), 1415(i)(2), 1439)