The Mediator scandal in France not only disgusted the nation but revealed just how the system can go wrong. Medical expert independence is essential to ensure drug security. Conflicts of interest are many and often kept secret. The pharmaceutical companies who finance research, specialised media and professional training, are often accused. But what is the truth ? Victims, doctors and government health officials have now been heard. Many disturbing revelations have come to light under the transparency laws. This is an exceptional investigative report.