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It may be accepted as a maxim that a poorly or improperly designed study involving human subjects one that could not possibly yield scientific facts (that is, reproducible observations) relevant to the question under study-is by definition unethical. Moreover, when a study is in itself scientifically invalid, all other ethical considerations become irrelevant. There is no point in obtaining informed consent to perform a useless study. A worthless study cannot possibly benefit anyone, least of all the experimental subject himself. Any risk to the patient, however small, cannot be justified. In essence, the scientific validity of a study on human beings is in itself an ethical principle.
Benjamin Freedman (Sun,) studied this question.