Support 21 Act of 2009

Support 21 Act of 2009 - Requires the Secretary of Transportation, acting through the Administrator of the National Highway Traffic Safety Administration, to establish a program under which at least two campaigns in support of enforcement of the minimum legal drinking age will be implemented per year for each of 2010 through 2014 to: (1) educate the public about the public health and safety benefits and basis for age-21 minimum legal drinking age laws; and (2) build public and parental support for, and cooperation with, enforcement of such laws.

Authorizes the Administrator of the Substance Abuse and Mental Health Services Administration (Administrator) to make supplemental grants to eligible entities to implement strategies to: (1) work with local pediatric health care providers to increase alcohol education, screening, and intervention provided to patients and persons under age 21; (2) give such providers access to the community sectors involved in collaborating on the implementation of comprehensive, community wide programs, strategies, and services to reduce underage alcohol use and abuse; (3) provide science-based alcohol information and education to caregivers of children and young adults through relevant community sectors; and (4) undertake activities to support the national campaigns.

Authorizes the Secretary of Health and Human Services (Secretary), acting through the Administrator, to make grants to professional pediatric medical organizations to increase effective practices to reduce the prevalence of alcohol use among individuals under the age of 21.

Requires the Secretary to establish within the Centers for Disease Control and Prevention (CDC) a focus on underage drinking prevention, including activities for: (1) expanding and disseminating research on strategies for reducing underage drinking; and (2) public health and state-level surveillance of underage drinking.

Requires the National Academy of Sciences to review and report to Congress on research regarding the influence of drinking alcohol on the development of the adolescent brain and the public policy implications.