33 CFR 20.804 - Objections and offers of proof.
(a) Any party objecting to the admission or exclusion of evidence shall concisely state the grounds. A ruling on every objection must appear in the record. No party may raise an objection to the admission or exclusion of evidence on appeal unless he or she raised it before the ALJ.
(b) Whenever evidence is objected to, the party offering it may make an offer of proof, which must appear in the record.