The Importance of Randomis Control Trials in Evidence Based Medicine

The idea that judgments about the effectiveness of treatment in medicine should be based on evidence is important trivial. The question is whether people make claims on behalf of randomization that are inflated, and therefore a view that's less positive than would be justified about non randemi studies. I think there have been cases where we've in effect known that something was effective without doing a randomis trial. In fact, therere a whole list of well established cases where that's true and where it therefore becomes unethical to do randomis control trials.