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Binding Polish legislation makes legality of conducting of medical experiments dependent on positive assessment (opinion) of expert groups, namely bioethics committees. This paper aims at answering a question, which particular arguments allow qualification of opinions on projects of medical experiments as individual authoritative acts. But, first and foremost – hypothetically assuming that we are dealing with an administrative act – the paper attempts at focusing attention on a circumstance that proceedings of bioethics committees should be undertaken and completed in accordance with elementary principles of administrative proceedings. These principles – regarding the work of committees on stating opinions on medical experiments – shall undergo a brief analysis.