Aside from the argument against placebo control when an adequate treatment exists, the whole basis of the evidence-based study is questionable. What the evidence-based crowd fails to recognise is that the methods of all these trials may have been so different that the results of the various studies are incomparable. Unfortunately, even the British Medical Journal is guilty of this spin on evidence-based medicine. As prime supporters, they seem to overlook the problems of these studies. The answer is contacts.
Every story has at least two sides to it.
So find the opponent. Don't rely purely on the contacts or the PR office for sources. It is in their interest to only put forward supporters of the story. In today's information-friendly age, it is easy to do a quick search on the web for critics. Look for lead names on referenced papers that appear to take an opposing view.