Where a third-country national or a stateless person has been refused admission to a Member State on one of the grounds set out in , namely that there were reasonable grounds for considering that third-country national or stateless person as a danger to the community, public policy, security or public health of the Member State concerned or the ground that an alert has been issued in the or in a national database of a Member State for the purpose of refusing entry, the related data should be stored for a period of three years from the date on which the negative conclusion on admission was reached. It is necessary to store such data for that length of time in order to allow other Member States conducting an admission procedure to receive information, including any information on the marking of data by other Member States, from Eurodac throughout the admission procedure, where necessary, by applying the grounds for refusal set out in . In addition, data on admission procedures that have previously been discontinued because the third-country nationals or stateless persons have not given or have withdrawn their consent should be stored for three years in Eurodac in order to allow the other Member States conducting an admission procedure to reach a negative conclusion, as permitted by that Regulation.