Hubbard and his colleagues present findings from a comprehensive national longitudinal study of the effectiveness of drug abuse treatment in the United States and offer a strong argument for continuing governmental support of treatment programs. Originally published in 1991. A UNC Press Enduring Edition -- UNC Press Enduring Editions use the latest in digital technology to make available again books from our distinguished backlist that were previously out of print. These editions are published unaltered from the original, and are presented in affordable paperback formats, bringing readers both historical and cultural value.