Questions of principle in the Doctors' Trial
In December 1946, a U.S. military tribunal in Nuremberg, Germany, began hearing United States v. Karl Brandt et al., charging 23 doctors and administrators with participation in war crimes and crimes against humanity. The case concerned human experiments in concentration camps and killings of sick and disabled people. It was part of the subsequent Nuremberg trials, distinct from the earlier International Military Tribunal for major war criminals. The court had to determine individual responsibility and explain what human experimentation could be permissible.
The defense compared some experiments with research in other countries, seeking to diminish the atrocities through appeals to scientific necessity. Medical advisers including Leo Alexander and Andrew Ivy contributed to discussion of principles. The 1947 judgment listed ten conditions in its section on permissible medical experiments, later known as the Nuremberg Code. It was not a scientific paper proposing and testing a hypothesis, but a product of a trial defining behavioral limits from evidence.
What voluntary consent requires
The first principle required voluntary human consent. It did not merely require a signed form: participants needed legal capacity to consent, freedom to choose without force, deception, duress or similar influences, and sufficient understanding of the research. Investigators had to explain in advance the experiment's nature, duration, purpose and methods, reasonably foreseeable inconvenience and dangers, and effects on the individual's health.
Knowing one is participating in research and being able to refuse thus both became part of valid consent. Concentration-camp prisoners lived under domination and violence and could not be called free volunteers because they obeyed orders or were registered as subjects. Those initiating, directing or engaging in research bore responsibility for verifying consent and could not evade it by delegating paperwork. Scientific qualifications did not empower researchers to decide for others whether they should undergo an experiment.
Scientific value does not remove limits
The second and third principles required social value, results not readily obtainable by other methods, and avoidance of arbitrary or unnecessary experimentation. Design had to rest on animal experiments and existing knowledge of the disease or problem. These requirements demanded a justification for research without declaring any method acceptable when the aim was important. Scientific necessity and protection of the individual had to be satisfied together.
Principles four through seven addressed harm and risk. Unnecessary physical and mental suffering should be avoided. Experiments were generally prohibited where there was prior reason to expect death or disability, with cautiously worded provision concerning experiments in which the physicians themselves also served as subjects. Risk must not exceed the humanitarian importance of the problem, and facilities had to be prepared against injury. This historical self-experimentation qualification cannot be expanded into general permission to harm others.
Both participants and researchers have powers and duties to stop
The eighth principle required scientifically qualified personnel and a high degree of skill and care at every stage. Responsibility extended to actual conduct, and initial approval or consent did not release researchers from continuing judgment. New circumstances could require reconsideration of personnel capability, facilities and original risk estimates; the initial plan was not an order that must be carried through to the end.
The ninth principle gave participants freedom to end an experiment when their physical or mental condition made continuation seem impossible. The tenth required the scientist in charge to be prepared to stop when there was reason to believe continuation might cause injury, disability or death. Their pairing matters: participants need not wait for an investigator's willingness to release them, and investigators must not wait for a participant to ask before protecting them. Withdrawal and proactive termination are complementary safeguards, not grounds for shifting responsibility.
From judgment provisions to an ethical reference
The ten principles circulated with the judgment and later official trial records, gradually becoming a major reference for human-research ethics. By placing participants' choice alongside professional judgment, they moved debate beyond whether a doctor meant well. Later documents developed informed consent, risk and research responsibilities further, but procedures such as independent ethics committees and research registration should not all be attributed to the Code itself.
Its historical influence also did not make it a universally directly applicable law from 1947 onward. National legislation, judicial reliance and medical interpretations of its scope remained subjects of extended debate. Annas, Grodin and others studied it at the intersection of medicine, law and human rights. Its enduring significance is that neither scientific nor state objectives cancel responsibility toward particular people; institutions still have to make that requirement verifiable and enforceable.