The U.S. General Accounting Office (www.gao.gov) is responsible for analzying the economic impact of various U.S. government programs. Over the years, they have conducted a variety of studies on U.S. government spending on drug control effects related to coca.

• U.S. Agencies Have Allotted Billions in Andean Countries, but DoD Should Improve Its Reporting of Results
  - U.S. GAO Report GAO-12-824, 10 July 2012
• U.S. Department of State's Counternarcotics Performance Management System
  - U.S. GAO Report GAO-11-564R, 26 May 2011
• International Programs Face Significant Challenges Reducing the Supply of Illegal Drugs but Support Broad U.S. Foreign Policy Objectives
  - U.S. GAO Report GAO-10-921T, 21 July 2010
• U.S. Counternarcotics Cooperation with Venezuela has Declined
  - U.S. GAO Report GAO-09-806, 20 July 2009
• Drug Reduction Goals [in Colombia] Were Not Fully Met, but Security Has Improved
  - U.S. GAO, Report GAO-09-71, 06 October 2008
• U.S. Nonmilitary Assistance to Colombia is Beginning to Show Intended Results, but Programs are not Readily Sustainable
  - U.S. GAO, Report GAO-04-726, 02 July 2004
• Coca Cultivation and Eradication Estimates in Colombia
  - U.S. GAO, Report GAO-03-319R, 08 January 2003
• Efforts to Develop Alternatives to Cultivating Illicit Crops in Colombia Have Made Little Progress and Face Serious Obstacles
  - U.S. GAO, Report GAO-02-291, 08 February 2002
• U.S. Assistance to Colombia Will Take Years to Produce Results [in Controlling Drugs]
  - U.S. GAO Report GAO-01-26, 17 October 2000
• U.S. Antidrug Efforts in Peru's Upper Huallaga Valley
  - U.S. GAO Report NSIAD-95-11, 07 December 1994
• Extent of [Drug War] Problems in Brazil, Ecuador and Venezuela
  - U.S. GAO, Report NSIAD-92-226, 05 June 1992
• U.S. Trade Impacts of Alternative Crops to Andean Coca
  - U.S. GAO, Report NSIAD-92-12, 28 October 1991
• Observations on Counternarcotics Programs in Colombia and Peru
  - U.S. GAO, Report NSIAD-92-2, 23 October 1991
• U.S. Programs in Peru Face Serious Obstacles
  - U.S. GAO, Report NSIAD-92-36, 21 October 1991
• Impact of DoD's Detection and Monitoring on Cocaine Flow
  - U.S. GAO, Report NSIAD-91-297, 19 September 1991
• Restrictions on U.S. Aid to Bolivia for Crop Development Competing with U.S. Agricultural Exports and their Relationship to U.S. Anti-Drug Efforts
  - U.S. GAO, Report T-NSAID-90-52, 27 June 1990
• U.S. Supported [Drug Control] Efforts in Colombia and Bolivia
  - U.S. GAO, Report NSIAD-89-24, 01 November 1988