With increased access to timely advanced diagnostic testing in ED rational resource utilization is becoming ever more important. In his Best Case Ever Dr. Shabhaz Syed argues that a patient at Janus General who presented to the ED with chest pain, died as a result of overinvestigation, and explains how understanding the factors that contribute to overinvestigation, Baysian theory, diagnostic decision analysis, radiation risk, and teaching "dogma" may help prevent overinvestigation in Emergency Medicine...