Pursuant to a legislative requirement, GAO evaluated the scope, purpose, and effectiveness of U.S. narcotics control efforts in Colombia and Bolivia. GAO found that U.S.-supported crop control, enforcement, and interdiction efforts in Colombia and Bolivia have not produced major reductions in coca and marijuana production and trafficking, and it is questionable whether the efforts will achieve major reductions in the near future. GAO found that Colombia's large-scale efforts have had little effect due to the: (1) unprecedented level of violence associated with narcotics control; (2) lack of an enforceable extradition treaty with the United States for narcotics offenses; (3) general reluctance of the Colombian military forces to become involved in narcotics enforcement; and (4) lack of safe and effective means of chemically eradicating coca. GAO also found that Bolivia's efforts have had little effect due to: (1) the lack of clear legislation in Bolivia outlawing coca cultivation and supporting government control and eradication programs; (2) an inexperienced and ineffective special narcotics police force; (3) limited Bolivian government funding for program objectives; and (4) generalized corruption. In addition, GAO found that the Department of State's Bureau of International Narcotics Matters (INM): (1) did not systematically evaluate program and project performance to assess progress against established goals and objectives or to redirect activities; and (2) does not have guidelines which clearly establish the responsibility for ensuring that INM units perform evaluations. GAO also found that the Agency for International Development's development and narcotics awareness programs in Bolivia have not been effective due to the unwillingness or inability of the Bolivian government to introduce and implement effective coca control and enforcement measures.