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Here are a few links that may help you in your search for answers.
http://www.familyfirstaid.org/at-risk-youth.html
http://www.childtrends.org/Files//Child_Trends-2006_10_01_RB_DefiningAtRisk.pdf
http://www.atriskyouthprograms.com/
http://extension.unh.edu/success/index.cfm?fuseaction=home.story&story_id=39
http://www.mrsc.org/subjects/humanservices/youth.aspx