OK I messed up! Boarded the LUAS yesterday evening in the IFSC and got off at Fatima forgetting to tag off. Was getting lift home from City Centre about an hour later and stopped at Kilmainham to tag off and get out of the system. BUT when I presented my LEAP card to the machine at Kilmainham it tagged me on again! My mistake has now cost me two maximum length journeys. I'm sure theres a policy document somewhere, however, does anyone know how to retrospectively tag off.