INTRODUCTION.
The terms Forensic Medicine, Legal Medicine, and Medical Jurisprudence have heretofore been used interchangeably to apply to those branches of state medicine and of jurisprudence which have to deal with the applications of medical knowledge to the elucidation of questions of fact in courts of law, and with the legal regulation of the practice of medicine.
Medico-legal science therefore includes all subjects concerning which members of the legal and medical professions may seek information of one another, each acting in his professional capacity. It consists of two distinct branches: that treating of medical law, to which the designation of Medical Jurisprudence properly applies; and that relating to the application of medical, surgical, or obstetrical knowledge to the purposes of legal trials, Forensic Medicine.[1]
The term State Medicine, which is sometimes erroneously used as synonymous with forensic medicine, properly applies to a more extended field of medical inquiry; i.e., to all applications of medical knowledge to the public welfare. State medicine, therefore, while excluding medical jurisprudence, includes, besides forensic medicine, public hygiene, medical ethics, medical education, and military and naval medicine.
Toxicology, the science of poisons, may be divided into medical toxicology, whose object is the prevention or cure of all forms of poisoning, and forensic toxicology, whose aim is the detection of criminal poisoning. In its last-named relation toxicology differs from forensic medicine in one important particular. In all cases other than those of poisoning in which questions involving medical knowledge arise, the answers are entirely within the functions of the physician, the surgeon, or the obstetrician, but the problems of forensic toxicology require for their solution the further aid of the chemist and the pharmacologist.
Forensic medicine is an applied science, partly legal, partly medical, calling for information and investigation in widely divergent lines, and becoming more minutely ramified with the progressive advances in medical knowledge and in those sciences of which medicine is itself an application. Its development has been dependent partly upon the slow though progressive tendency of medicine from the condition of an empirical art toward that of an exact science, and partly upon the more rapid and more advanced development of criminal jurisprudence. Medical jurisprudence had reached a high development during the early history of the Roman Empire, and at a period long anterior to the first recognition of forensic medicine.
Although the literature of modern medico-legal science is very largely written from the medical point of view and by physicians, its earlier history is to be found in fragmentary form, partly in medical literature, but principally in the writings of historians, in the earlier criminal codes, and in the early records of legal proceedings.
In the earliest historical periods the functions now exercised by the priest, the lawyer, and the physician were performed by the same person, who, presumably, made use of what medical knowledge he possessed in the exercise of his legal functions. Among the Egyptians at a very early period it is certain that medical questions of fact were considered in legal proceedings, and that the practice of medicine was subject to legal regulation. According to Diodorus,[2] “when a pregnant woman was condemned to death, the sentence was not executed until after she was delivered.” The same author tells us[3] that “the physicians regulated the treatment of the sick according to written precepts, collected and transmitted by the most celebrated of their predecessors. If, in following exactly these precepts which are contained in the sacred books, they did not succeed in curing the sick, they could not be reproached, nor could they be prosecuted at law; but if they have proceeded contrary to the text of the books, they are tried, and may be condemned to death, the legislator supposing that but few persons will ever be found capable of improving a curative method preserved during so long a succession of years and adopted by the most expert masters of the art.” With the system of legal trial in use among the Egyptians[4] it is difficult to imagine that the question of the existence of pregnancy in the one case, or of malpractice in the other, would not be the subject of contest, and, if contested, determined without the testimony of obstetricians or of physicians.[5]