The United States has used multiple U.S. agencies and a private, not-for-profit entity to implement the domestic and international provisions of the Clean Diamond Trade Act (CDTA). The Departments of State and the Treasury have led U.S. efforts to implement the domestic provisions of the act; State has led the U.S. efforts to curtail trade in conflict diamonds abroad. Domestically, the Departments of State, the Treasury, Homeland Security, and Commerce, and the private entity, called the U.S. Kimberley Process Authority (USKPA), have been responsible for controlling U.S. imports and exports of rough diamonds. Internationally, State, the U.S. Agency for International Development (USAID), and the U.S. Geological Survey have helped to strengthen KPCS. Domestically, the U.S. systems for reporting rough diamond statistics and for controlling imports and exports of these diamonds are vulnerable to illicit trade. The United States has enhanced the quality of its rough diamond trade data by improving its collection processes, but work remains to be done. Also, the United States does not periodically inspect rough diamond imports or exports to ensure that the contents of the rough diamond parcels match the Kimberley Process certificates. In addition, the United States lacks an effective system for confirming receipt of imports -- a Kimberley Process requirement for avoiding possible diversions of rough diamond imports.