Before entering a Walt Disney World theme park, guests are asked to place their tickets and a finger in a scanner. When identification is made, the guests are allowed in.
The scanner measures a series of points for identification; technically it's a numerical image, not an actual fingerprint.
The reason the scanners are used is to prevent fraud. People can't buy multi-day passes (which are discounted) and then sell the unused days.
By allowing guests to enter the parks without having to show identification, the scanners save time and help keep the lines moving.
The images are stored in a system that is separate from all other Disney systems, and they are purged 30 days after the ticket is used.
Guests with privacy concerns may opt to show ID instead of having their finger scanned.
