Here are some links to the sites that provide more information about what you might need to know.
U.S. Customs and Border Protection: www.cbp.gov
U.S. Department of Commerce: www.commerce.gov
Department of Homeland Security: www.dhs.gov
International: Maritime Organization: www.imo.org
U.S. Food and Drug Administration: www.fda.gov
U.S. International Trade Commission: www.usitc.gov