“By the Pentagon’s own definition, the U.S. and its allies have failed to curb the drug trade in Afghanistan that provides 90 percent of the world’s heroin and is the main source of funding for the Taliban. The United Nations has pledged to fill the counter-narcotics vacuum left by the withdrawing allies, but that effort will be dependent on continuing contributions from donor states. To continue anti-drug efforts past 2014, the U.S. must include DEA agents with the long-term residual force that President Obama plans to leave behind post-2014, according to the Senate Caucus on International Narcotics Control.”
http://www.military.com/daily-news/2013/08/09/sputtering-war-on-drugs-in-afghanistan.html