The epidemiologist as an expert witness

Epidemiology is becoming more important in the resolution of torts. As a result, epidemiologists are now much in demand as expert witnesses, a role in which they may contribute much to society. In order to do this, epidemiologists should become familiar with the techniques and the ethics of our adversarial legal system. As an expert witness, the epidemiologist subscribes to an enforceable ethical code. Expert witnesses are subject to many motivations. These include the advocacy of truth and the gaining of professional satisfaction. Other motives, including the wish for financial remuneration, may be less altruistic but are not inherently bad. It is unethical, in the absence of supporting evidence, to suggest that an expert witness has altered his testimony in order to enhance his remuneration.