. "Until March 2003, the United States Customs Service was the portion of the U.S. federal government dedicated to keeping illegal products outside of U.S. borders. It also regulated what could leave the United States and was partially responsible for who could enter the United States."@en . . "Until March 2003, the United States Customs Service was the portion of the U.S. federal government dedicated to keeping illegal products outside of U.S. borders. It also regulated what could leave the United States and was partially responsible for who could enter the United States."@en . . . . . "United States Customs Service"@en . .