Jonathan J. Koehler

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Converging legal and scientific forces are pushing the traditional forensic identification sciences toward fundamental change. The assumption of discernible uniqueness that resides at the core of these fields is weakened by evidence of errors in proficiency testing and in actual cases. Changes in the law pertaining to the admissibility of expert evidence in(More)
The way in which statistical DNA evidence is presented to legal decision makers can have a profound impact on the persuasiveness of that evidence. Evidence that is presented one way may convince most people that the suspect is almost certainly the source of DNA evidence recovered from a crime scene. However, when the evidence is presented another way, a(More)
A form of betrayal occurs when agents of protection cause the very harm that they are entrusted to guard against. Examples include the military leader who commits treason and the exploding automobile air bag. We conducted five studies that examined how people respond to criminal betrayals, safety product betrayals, and the risk of future betrayal by safety(More)
The Prehospital Index (PHI) is a triage-oriented trauma severity scoring system comprising four components: systolic blood pressure, pulse, respiratory status, and level of consciousness, each scored 0 to 5. The PHI was developed after analysis of 313 cases to provide an objective prehospital scoring system for distinguishing less seriously injured patients(More)
The way people respond to the chance that an unlikely event will occur depends on how the event is described. We propose that people attach more weight to unlikely events when they can easily generate or imagine examples in which the event has occurred or will occur than when they cannot. We tested this idea in two experiments with mock jurors using written(More)
M utual fund companies selectively advertise their better-performing funds. However, investors respond to advertised performance data as if those data were unselected (i.e., representative of the population). We identify the failure to discount selected or potentially selected data as selection neglect. We examine these phenomena in an archival study (Study(More)
The study of 17 cases of acute pancreatitis, in whom early total or subtotal pancreatic resection were performed, has led to the following therapeutic principles: the serious nature of acute post-operative pancreatitis has convinced us of the necessity for early intervention and as extensive a resection as possible; 5 out of 6 patients were cured in this(More)