"Prescription drug monitoring programs are designed to facilitate the collection, analysis, and reporting of information on the prescribing, dispensing, and use of controlled substances within a state. They provide data and analysis to state law enforcement and regulatory agencies to assist in identifying and investigating activities potentially related to the illegal prescribing, dispensing, and procuring of controlled substances."

Source

General Accounting Office, "Prescription Drugs: OxyContin Abuse and Diversion and Efforts to Address the Problem," GAO-04-110 (Washington, DC: Government Printing Office, Dec. 2003), p. 15.
http://www.gao.gov/new.items/…