Insurance implications? (Score 5, Informative)

I recently attended a legal studies lecture in which the professor (a lawyer) asserted that if any of us were to participate in such a program and any disease or predisposition for disease were discovered, that we would be legally obligated to make this known to any potential medical insurers the next time we apply for medical insurance. According to this lawyer, failure to disclose in this manner would result in annulment of the insurance should the failure be discovered.