BMJ has three articles on their main page under the heading Doctors and the Drug Industry.

The three articles are:
Say no to the free lunch -Fiona Godlee, editor, briefly states how little has changed in the drug industry regarding relationship and perks with drug reps and doctors. Provides links to related articles
The influence of big pharma -Editorial by R E Ferner, director, also briefly reports the widespread influences of the drug industry within England. Provides links to references as well as related articles.
Confessions of a drug rep -Film review Jeanne Lenzer, medical investigative journalist, on a movie which claims to give an inside look at the pharmacy industry, specifically pharmacy reps and the extremes they go to get more sales from doctors. An illuminating bit of information is that pharmacy reps know the prescribing information for each doctor. They know whether the doctor is prescribing more of one drug over another. Every single drug they prescribe has been tracked and the drug reps have that information.