Also contentious is NAFTA's Chapter 19, which subjects antidumping and countervailing duty (AD/CVD) determinations to binational panel review instead of, or in addition to, conventional judicial review. For example, in the United States, review of agency decisions imposing antidumping and countervailing duties are normally heard before the U.S. Court of International Trade, an Article III court. NAFTA parties, however, have the option of appealing the decisions to binational panels composed of five citizens from the two relevant NAFTA countries. The panelists are generally lawyers experienced in international trade law. Since the NAFTA does not include substantive provisions concerning AD/CVD, the panel is charged with determining whether final agency determinations involving AD/CVD conform with the country's domestic law. Chapter 19 can be considered as somewhat of an anomaly in international dispute settlement since it does not apply international law, but requires a panel composed of individuals from many countries to reexamine the application of one country's domestic law. A Chapter 19 panel is expected to examine whether the agency's determination is supported by "substantial evidence." This standard assumes significant deference to the domestic agency. Some of the most controversial trade disputes in recent years, such as the U.S.-Canada softwood lumber dispute, have been litigated before Chapter 19 panels. Decisions by Chapter 19 panels can be challenged before a NAFTA extraordinary challenge committee. However, an extraordinary challenge committee does not function as an ordinary appeal. Under the NAFTA, it will only vacate or remand a decision if the decision involves a significant and material error that threatens the integrity of the NAFTA dispute settlement system. Since January 2006, no NAFTA party has successfully challenged a Chapter 19 panel's decision before an extraordinary challenge committee.