((a)) For additional prohibitions relating to this chapter and enforcement of this chapter, see .

((b)) To the extent authorized under the convention or by agreements between the United States and any contracting party concluded pursuant to for international enforcement, the duly authorized officials of such party shall have the authority to carry out enforcement activities with respect to this chapter that are otherwise authorized by law with respect to persons or vessels subject to the jurisdiction of the United States, and the officials of the United States authorized pursuant to this section shall have the authority to carry out enforcement activities with respect to this chapter that are otherwise authorized by law with respect to persons or vessels subject to the jurisdiction of such party, except that where any agreement provides for arrest or seizure of persons or vessels under United States jurisdiction it shall also provide that the person or vessel arrested or seized shall be promptly handed over to a United States enforcement officer or another authorized United States official.