To amend the Public Health Service Act with respect to the provision to at-risk communities of services under the program of block grants for the prevention and treatment of substance abuse.

Amends the Public Health Service Act to authorize appropriations to carry out provisions relating to substance abuse prevention and treatment block grants, substance abuse data collection, and a national database on substance abuse prevention. Requires that States spend a minimum percentage of the grants on drug abuse prevention and treatment in communities with a significant number of individuals who are at risk of developing drug abuse (in addition to amounts required by other provisions for such individuals).