50 CFR 600.1203 - Prohibitions.
(a) It is unlawful for any person to do, or attempt to do, any of the following:
(1) Remove a fin at sea.
(8) When requested, fail to allow an authorized officer or any employee of NMFS designated by a Regional Administrator, or by the Director of the Office of Sustainable Fisheries in the case of the Atlantic Highly Migratory Species, access to or inspection or copying of any records pertaining to the landing, sale, transfer, purchase, or other disposition of fins or shark carcasses.
(b) For purposes of this section, it is a rebuttable presumption that:
(2) If, after landing, the total weight of fins landed from any vessel exceeds five percent of the total weight of shark carcasses landed, such fins were taken, held, or landed in violation of this section.