31 N7 to seek an advisory opinion from a superior. Essentially, such requests will be considered on a case-by-case basis.In Matter of Duckett, 19 I&N Dec. 493 (BIA 1987), the Board of Immigration Appeals held that activities that further international commerce and business are permissible under B-1 status. Regulatory memoranda have made clear that B-1 business visitors may not perform work that is part of the United States labor market.