Abstract
The text is devoted to consideration on the morally desirable way of clarifying the ambiguities identified in a previous part of the double voice. So it contains deliberations on meaning and authority of biological material donor informed consent. Considering research on human corpses the author focus on two questions: why deceased patient?s premortem preferences should be taken into account at all and whether ?an advance research directives? of that kind should take a form opt-in or opt-out arrangements? Whereas when it comes to research on biological samples the most important question is what type of actual ? not presumed - consent meet ethical standards.