united-states-v-david-arias-villanueva-united-states-of-america-v-carlos , 998 F.2d 1491 ( 1993 )
Immigration & Naturalization Service v. Delgado , 104 S. Ct. 1758 ( 1984 )
United States v. Mendenhall , 100 S. Ct. 1870 ( 1980 )