Prescription drugs are being misused and abused by a wide variety of people. According to SAMHSA, about 26 million Americans between the ages of 26 and 50 report they have used prescription drugs non-medically at some point in their life. Other age groups have lower lifetime incidents: 13 million who are age 50 or older, 9 million who are age 18 to 25, and 3 million who are 12 to 17 years of age.
Attached is a link to a Q&A with Michael Klein, Ph. D. about Combating Misuse and Abuse of Prescription Drugs - which I feel is relevant to the workplace as well. Having handled many workers compensation claims in a variety of jurisdictions including Kentucky and Wisconsin, drugs like Oxycontin and resulting addiction can undoubtedly impact a workers compensation claim in a negative way.
http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm220112.htm