Several researchers were interested in the satisfaction of the persons having participated in a study while in situation of vulnerability. If most research verified the satisfaction of the individuals at the end of research process, few investigated participant’s satisfaction several months after the end of the research. The current study aims at comparing the satisfaction of two groups of persons having participated in a research. A group of 20 persons in grief after a suicide was interviewed after the process of research, while a group of 20 persons, also in grief after a suicide, were questioned one year after their participation in a scientific research. The results of both groups were similar and demonstrate a high level of satisfaction. All the participants would agree to participate in the experiment again and all of them would recommend other people in grief to participate in such a study. The researches which seek individuals’ participation in grief after a suicide can be beneficial for the participants and respect all the ethical standards as for the validity of the consent.