Congress and President Bush have done the right thing, lifting a disastrous nine-year ban that prevented Washington from using locally raised tax dollars on needle-exchange programs that help fight the spread of AIDS. Unfortunately, that still leaves in force an even broader and more damaging law that prohibits the use of federal funds for needle-exchange programs in the United States or abroad.

The country’s most important medical and public health organizations endorsed needle-exchange programs more than a decade ago, and such programs have proved highly successful all over the world. Opponents’ charges that needle exchanges would encourage addiction have turned out to be nonsense.