I wish I had time to do a longer blog on how information about your prescription drug purchases is used both for marketing more prescriptions and, paradoxically, as this article shows, insurance denials. For now, read this excellent Business Week story They Know What's in Your Medicine Cabinet:

An untold number of people have been rejected for medical coverage for a reason they never could have guessed: Insurance companies are using huge, commercially available prescription databases to screen out applicants based on their drug purchases.