Argument: War on Drugs is simply too expensive
The United States efforts at drug prohibition started out with a US$ 350 million budget in 1971, and is currently (in 2006) a US$ 30 billion campaign. These numbers only include direct prohibition enforcement expenditures, and as such only represent part of the total cost of prohibition. This $ 30 billion figure rises dramatically once other issues, such as the economic impact of holding 400,000 prisoners on prohibition violations, are factored in.
The war on drugs is extremely costly to such societies that outlaw drugs in terms of taxpayer money, lives, productivity, the inability of law enforcement to pursue mala in se crimes, and social inequality. Some proponents of decriminalization say that the financial and social costs of drug law enforcement far exceed the damages that the drugs themselves cause. For instance, in 1999 close to 60,000 prisoners (3.3% of the total incarcerated population) convicted of violating marijuana laws were behind bars at a cost to taxpayers of some $ 1.2 billion per year. In 1980, the total jail and prison population was 540,000, about one-quarter the size it is today. Drug offenders accounted for 6% of all prisoners. Today drug offenders account for nearly 25%. It has been argued that if the US government legalised marijuana it would save $7.7 billion per year in expenditure on enforcement of prohibition. Also, that marijuana legalization would yield tax revenue of $2.4 billion annually if it were taxed like all other goods and $6.2 billion annually if it were taxed at rates comparable to those on alcohol and tobacco.