A letter report issued by the Government Accountability Office with an abstract that begins "Between 1998 and 2004, Congress appropriated over $1.2 billion to the Office of National Drug Control Policy (ONDCP) for the National Youth Anti-Drug Media Campaign. The campaign aimed to prevent the initiation of or curtail the use of drugs among the nation's youth. In 2005, Westat, Inc., completed a multiyear national evaluation of the campaign. GAO has been mandated to review various aspects of the campaign, including Westat's evaluation which is the subject of this report. Applying generally accepted social science research standards, GAO assessed (1) how Westat provided credible support for its findings and Westat's findings about (2) attitudes, beliefs, and behaviors of youth and parents toward drug use and (3) youth self-reported drug use."