A letter report issued by the Government Accountability Office with an abstract that begins "Each year, billions of dollars in dual-use items--items that have both commercial and military applications--as well as defense items are exported from the United States. To protect U.S. interests, the U.S. government controls the export of these items. A key function in the U.S. export control system is enforcement, which aims to prevent or deter the illegal export of controlled items. This report describes the roles, responsibilities, and authorities of export control enforcement agencies, identifies the challenges these agencies face, and determines if information on enforcement outcomes is provided to the export control agencies. GAO's findings are based on an examination of statutes, interagency agreements, and procedures; interviews with enforcement officials at selected field locations and headquarters; and an assessment of enforcement information."