from Walter Williams:
FDA Policies Kill
Among the U.S. Food and Drug Administration’s responsibilities are approval and regulation of pharmaceutical drugs. In short, its responsibility is to ensure the safety and effectiveness of drugs. In the performance of this task, FDA officials can make two types of errors — statistically known as the type I error and type II error. With respect to the FDA, a type I error is the rejection or delayed approval of a drug that is safe and effective — erring on the side of over-caution — and a type II error is the approval of a drug that has unanticipated dangerous side effects, or erring on the side of under-caution.