To extend the authorization of the Drug-Free Communities Support Program for an additional 5 years, to authorize a National Community Antidrug Coalition Institute, and for other purposes.

Amends the National Narcotics Leadership Act of 1988 to extend the authorization of appropriations for the Drug-free Communities Support Program and the Advisory Commission on Drug-free Communities through FY 2007. Increases from three percent to six percent the administrative costs cap for FY 2002, and extends it through FY 2006. Authorizes additional grants and renewal grants (of up to $75,000 each) to eligible coalitions and grant recipients.

Declares that funds appropriated for the substance abuse activities of a coalition that includes a representative of the Bureau of Indian Affairs, the Indian Health Service, or a tribal government agency with expertise in the field of substance abuse may be counted as non-Federal funds raised by the coalition.

Requires that priority in the awarding of grants be given to a coalition serving economically disadvantaged areas.

Authorizes supplemental grants for coalition mentoring activities to support and encourage the development of new, self-supporting community coalitions focused on the prevention and treatment of substance abuse in their communities. Requires that grant priority be given to a coalition serving economically disadvantaged areas.

Authorizes the Director of the Office of National Drug Control Policy to make a grant to an eligible organization to provide for establishment of a National Community Antidrug Coalition Institute to: (1) provide education, training, and technical assistance for coalition leaders and community teams; (2) develop and disseminate evaluation tools, mechanisms, and measures to better assess and document coalition performance measures and outcomes; and (3) bridge the gap between research and practice by translating knowledge from research into practical information.

Requires the Director of the Office of National Drug Control Policy to ensure that the same or similar activities are not carried out, through the use of funds for administrative costs or funds provided under this Act, by more than one recipient.