Parents want to know where are their kids, and make sure everything is OK. Using ID, cards or whatever is more complicated than using some biometrics: they never forget, and also there is no risk of loosing the token: this could be very practical!
Imagine also if your kid has some problems with some specific kind of food: it is easy to check with biometrics.
In Korea, to record if the child are here (?) www.newscham.net
(2005) A child uses the Sweet Finger identification system while boarding a school bus in Ontario.
The Ontario-Montclair School District uses the system to track pupils.
Terry Pierson / The Press-Enterprise
Biometric systems automate the payment and accounting of school lunches.
Stephanie Schwenke lifts her finger off the biometric-scan pad as an image of her fingertip appears on screen during lunch at Cumberland-Anita-Massena Middle School in Massena, Iowa, in 2003. Districts in Iowa have stopped using such equipment because of a new law that bars schools from fingerprinting students. —File photo by Steve Pope/AP