For each clinical investigation with the exception of that which does not involve any risk or constraint and in which all the procedures are carried out and the products are used in the usual way, the dossier submitted to the Data Protection Committee and the competent authority must determine whether it is necessary for the person not to be able to participate simultaneously in another clinical investigation and, if so, must set a period of exclusion during which the person who is the subject of the investigation may not participate in another clinical investigation. The length of this period varies according to the nature of the research referred to in this Title.