Children's Mental Health Screening and Prevention Act of 2003 - Directs the Secretary of Health and Human Services, the Secretary of Education, and the Attorney General to jointly make ten three-year demonstration grants to implement evidence-based preventive-screening tools to detect mental illness and suicidal tendencies in school-age youth and to refer those youth in need of assessment or treatment.
Makes eligible to receive such a grant, as a demonstration facility, any facility that serves at-risk youth or performs outreach to school-age youth, including any elementary school, secondary school, school-based health center, juvenile justice facility, foster care setting, homeless shelter, youth drop-in center, youth outreach organization, youth residential treatment center, or State or local mental health organization. Requires applicants to form multidisciplinary project implementation committees and to agree to certain information collecting and reporting requirements.