Medical and Chemical Expertise in English Trials for Criminal Poisoning, 1750–1914

Abstract

This article contributes to the literature on the history of medico-legal practice by using a survey of 535 poisoning cases to examine the emergence of forensic toxicological expertise in nineteenth-century English criminal trials. In emphasizing chemical expertise, it seeks both to expand upon a limited literature on the history of the subject, and to offer a contrast to studies of criminal poisoning that have tended to focus primarily on medical expertise. Poisoning itself is a topic of abiding interest to historians of forensic medicine and science because (together with insanity) it long tended to attract the greatest attention (and often confrontation) in criminal proceedings. In looking at a wide number of cases, however, it becomes apparent that few aroused true medico-legal controversy. Rather, the evidence from several hundred cases tried as felonies during the eighteenth and nineteenth centuries indicates that prior to the 1830s few presented any opportunity for “a battle of experts”. While Ian Burney and Tal Golan have shown that this was certainly not the case during the mid and late nineteenth century, this paper goes further by dividing the period under study into three distinct phases in order to show how expert testimony (and experts themselves) changed during the course of the century, and why this process opened a door to the potential for formalized controversy.