you're right .. "$1.5T over 41 years would mean an average of $36.59B/year" .. and ..
Costs to taxpayers
A 2008 study by Harvard economist Jeffrey A. Miron has estimated that legalizing drugs would save taxpayers $76.8 billion a year in the United States — $44.1 billion from law enforcement savings, and at least $32.7 billion in tax revenue ($6.7 billion from marijuana, $22.5 billion from cocaine and heroin, remainder from other drugs).
Low taxation in Central American countries has been credited with weakening the region's response in dealing with drug traffickers. Many cartels, especially Los Zetas have taken advantage of the limited resources of these nations. 2010 tax revenue in El Salvador, Guatemala, and Honduras, composed just 13.53% of GDP. As a comparison, in Chile and the U.S., taxes were 18.6% and 26.9% of GDP respectively. However, direct taxes on income are very hard to enforce and in some cases tax evasion is seen as a national pastime.
hang head, i didn't think about it at all .. that $20 billion for 2010 is obviously too low .. $44.1 billion (above) in 2008 makes your 1.5 trillion look pretty safe .. this one cuts it lower ..