U.S. Customs and Border Protection is primarily responsible for enforcing import regulations in the United States, according to the U.S. Department of Homeland Security. The agency works to prevent counterfeit, unsafe and fraudulent goods from entering the United States.
Additionally, U.S. Customs and Border Protection follows agricultural import regulations set by the U.S. Department of Agriculture, advises the U.S. Department of Homeland Security. Working with the Animal and Plant Health Inspection Service of the USDA, the CBP ensures that people do not import prohibited agricultural items. The U.S. Food and Drug Administration is responsible for all fish products that enter the United States, notes the FDA.