The National Clearinghouse for Alcohol and Drug Information (NCADI) has developed the National Substance Abuse Web Index (NSAWI) to provide rapid access to high quality, authoritative information on substance abuse prevention and treatment. The NSAWI currently indexes all documents residing on 24 private and government Websites, including the National Institute on Alcohol Abuse and Alcoholism (NIAAA), the Substance Abuse and Mental Health Services Administration (SAMHSA), and the National Institute on Drug Abuse (NIDA), among others. The NSAWI offers a local search engine, allowing users to conduct broadcast searches of all indexed sites. However, the rudimentary search facility limits users to keyword queries.