Massive drug control spending has no effect on addiction rate

Who benefits from the $1.5 trillion that taxpayers have given to the drug law enforcement industry?

En Passant's comment on Balko's blog nails it:

If addiction rates increase, drug warriors need more money to increase their efforts, or to use new and more expensive methods.

If addiction rates decrease, drug warriors need more money because their methods are effective, and more money will eliminate addiction entirely.

Everything You Need To Know About the War on Drugs