marihuana
(2) If any of such merchandise so found consists of heroin, morphine, cocaine, isonipecaine, or opiate, the master of such vessel or person in charge of such vehicle or the owner of such vessel or vehicle or any person directly or indirectly responsible for heroin, morphine, cocaine, isonipecaine, or opiate being in such merchandise shall be liable to a penalty of $1,000 for each ounce thereof so found. If any of such merchandise so found consists of smoking opium, opium prepared for smoking, or marihuana, the master of such vessel or person in charge of such vehicle or the owner of such vessel or vehicle or any person directly or indirectly responsible for smoking opium, opium prepared for smoking, or marihuana being in such merchandise shall be liable to a penalty of $500 for each ounce thereof so found. If any of such merchandise so found consists of crude opium, the master of such vessel or person in charge of such vehicle or the owner of such vessel or vehicle or any person directly or indirectly responsible for crude opium being in such merchandise shall be liable to a penalty of $200 for each ounce thereof so found. Such penalties shall, notwithstanding the proviso in section 1594 of this title (relating to the immunity of vessels or vehicles used as common carriers), constitute a lien upon such vessel which may be enforced by a libel in rem; except that the master or owner of a vessel used by any person as a common carrier in the transaction of business as such common carrier shall not be liable to such penalties and the vessel shall not be held subject to the lien, if it appears to the satisfaction of the court that neither the master nor any of the officers (including licensed and unlicensed officers and petty officers) nor the owner of the vessel knew, and could not, by the exercise of the highest degree of care and diligence, have known, that such narcotic drugs were on board. Clearance of any such vessel may be withheld until such penalties are paid or until a bond, satisfactory to the Customs Service, is given for the payment thereof. The provisions of this paragraph shall not prevent the forfeiture of any such vessel or vehicle under any other provision of law. As used in this paragraph, the terms “opiate” and “marihuana” shall have the same meaning given those terms by sections 802(18) and 802(16), respectively, of title 21.