40 Years of War on Drugs:Prohibition II : A Trillion Dollars Down the Drain http://theragblog.blogspot.com/2010/05/prohibition-ii-trillion-dollars-down.html

$20 billion to fight the drug gangs in their home countries. In Colombia, for example, the United States spent more than $6 billion, while coca cultivation increased and trafficking moved to Mexico — and the violence along with it.