Years ago, when we used to live in Connecticut and vacation in Orlando, we always bought multiple-day, multiple-park Disney tickets. We never used them up in one vacation, but that was okay. They had no expiration date and they were transferrable. That was a big selling point. We used them up eventually, especially after we moved to Orlando. We even transferred them among family members. In other words, the person who bought the ticket was not necessarily the one who rode the Tower of Terror.
Eventually, Disney figured out that this method, despite the fact that it generated more sales from people like us, was costing them money. They figured out that making the tickets non-transferrable, with an expiration date, would generate more income by generating more customers. Worked like a charm. And their identifier has been a simple thumbprint at the entrance gates. Once you use a ticket, it gets attached to your thumbprint and then you are the only one allowed to use that ticket.
To take it one step further, if you bring in an extra unused ticket and try to use it to get an extra FastPass, it doesn't work. Their software reads whether or not that ticket is in use by a person who submitted their thumbprint on that very day. No thumbprint, no FastPass.
So what's so hard about registering legal voters, welfare recipients, workers and more by their thumbprint? If Mickey Mouse can do it, why can't the U.S. government? Maybe it's just one more thing we should give over to Disney. They already have ESPN and ABC. Why not give them USA? They obviously can run a business for profit.