ProPublica is investigating how Pharmaceuticals Industry money reaches physicians, and the credentials and calibre of the physicians it uses. See this article.
Extract: "In 2001, the U.S. Food and Drug Administration ordered Pennsylvania doctor James I. McMillen to stop “false or misleading” promotions of the painkiller Celebrex, saying he minimized risks and touted it for unapproved uses. Still, three other leading drug makers paid the rheumatologist $224,163 over 18 months to deliver talks to other physicians about their drugs."
There are many interesting Comments beneath the article.