1. 2010 Census Data www.census.gov
2. 2009 US Bureau of Labor Statistics www.bls.gov
3. Non-medical use, abuse and dependence on prescription opioids among U.S. adults: Psychiatric, medical and substance use correlates;Becker;Drug Alcohol Depend,2008
4. Unintentional and undetermined poisoning deaths-11 states, 1990-2001;Centers for Disease Control and Prevention;MMWR,2004
5. Increase in poisonings deaths caused by non-illicit drugs-Utah, 1991-2003;Centers for Disease Control and Prevention;MMWR,2005