No _legal regulations_ regarding the question of admissibility of medical experiments in civilized countries are _known_. However, it is a fact that such experiments have been carried out to a greater or lesser extent within the memory of man in all countries and up till now have remained unopposed. But with the development of medical knowledge and modern methods of research, experiments on human beings have increased considerably. Today, when research, to solve its problems and meet its challenges, has advanced into the most widely differentiated spheres, they are considered absolutely necessary. Accordingly, human experiments will continue to increase with the progress of science and the _problem_ that this trial has raised will always be _urgent_. Moreover, reference is made to the opinion of the Washington anatomist, E. V. Cowdry, on the necessity of human experiments in cancer research (_Karl Brandt 50, Karl Brandt Ex. 56_), and the order for human experiments on the part of the British Military Government for Professor McCance in Wuppertal. The knowledge of such experiments on human beings was, as literature shows, at first limited to medical specialist circles and the official authorities concerned. Only in recent times has _the public_ been cautiously informed. (_Becker-Freyseng 60, Becker-Freyseng Ex. 58._) Complete instruction of the public is only necessary so that, in case of an eventual discussion, sound judgment of the actions of the researcher may be possible. Reference is also made to the remarkable publication on the malaria experiment on 800 prisoners in the United States, published in the widely circulated periodical “Life” (_Karl Brandt 1, Karl Brandt Ex. 1_). The number of the imprisoned persons to be experimented upon was even more than 2,000, according to the radio account submitted. Repeated reports on such experiments have so far been _received without opposition_ by specialist circles, the authorities, and also the general public. From that can be gathered what in principle is considered permissible and right by competent authorities and the public. The experiments actually carried out are a mirror of the existing laws and one can by way of _legal sociological investigation find the norms of law_ that have validity. This is done where the law is not codified. In the same manner, the International Military Tribunal has derived the existing international law on the basis of its phenomena and the same procedure leads to the determination of the common law. Inasmuch as positive regulations exist in the United States which are contradictory to the law derived from the phenomena, these legal regulations must be produced or else the _conclusions_ that can be drawn from the experiments must be regarded _in favor of the defendant_ as valid law and an expression of fundamental principles of punishment.