the dis- trict court imposing pretrial detention pur- suant to 18 U.S.C. § 3142(e). We affirm.' FACTS On April 30, 1987, Jorge Enrique Gaviria and Jose Elkin Echeverry were arrested and charged with several Title 21 narcotics offenses. The government requested tem- porary detention of Gaviria and Echeverry pursua