Currently at Animal Kingdom, if a persons bio-metric scan fails multiple times they will be sent to guest relations where they will be asked a some questions. Once the questions are answered their picture will be taken and attached to their ticket, so if the bio-metric fails again at another park the cast member can check the picture attached to the ticket. It is expected to be rolled out to all 4 parks in early March. A similar system is already in place at Disneyland.