Giving the lunch lady the finger

When I was in college I frequently was the guy responsible for making sure everybody swiped their ID card to go up to the cafeteria. This would have made my life way easier. Finger print scanners have been around for a while, but I've not heard of using them in this way. Having your finger print attached to an account in order to pay for your lunch is an ingenious use of the technology. I can understand how it would help with the rush - as well as the number of people that will always forget their ID cards.