If the State of arrival refuses admission to persons, vehicles, animals or goods, or if persons decide not to pass through the frontier controls of the State of arrival, or send or take back any vehicles, animals or goods which are accompanying them, the authorities of the State of departure may not refuse to accept back such persons, vehicles, animals or goods. However, the authorities of the State of departure may take any measures to deal with them in accordance with national law and in a way which does not impose obligations on the other State.