Thirty Years and Billions of Dollars - Domestically grown marijuana is one of the top cash crops in the U.S.

Milton Friedman: Legalize It!
Milton Friedman leads a list of more than 500 economists from around the U.S. who today will publicly endorse a Harvard University economist's report on the costs of marijuana prohibition and the potential revenue gains from the U.S. government instead legalizing it and taxing its sale. Ending prohibition enforcement would save $7.7 billion in combined state and federal spending, the report says, while taxation would yield up to $6.2 billion a year.