1. Centers for Disease Control and Prevention National Vital Statistics System mortality data 2015 http://www.cdc.gov/nchs/deaths.htm
2. The White House: Office of the Press Secretary FACT SHEET: Obama Administration Announces Public and Private Sector Efforts to Address Prescription Drug Abuse and Heroin Use https://www.whitehouse.gov/the-press-office/2015/10/21/fact-sheet-obama-administration-announces-public-and-private-sector
3. U.S. General Accounting Office Report to Congressional Requesters, #GAO-04-110 Washington, DC 2013
4. Mechanisms of prescription drug diversion among drug involved club and street based populations;Inciardi;Pain Med,2007
5. U.S. Department of Justice, Drug Enforcement Administration National drug threat assessment summary 2014 http://www.dea.gov/resource-center/dir-ndta-unclass.pdf