http://www.bbc.co.uk/news/world-latin-america-17484532 I kind of think thats a good idea. It sends the parent a text when their kid enters the building and a text if they dont show up to class.
One kid carries a bag of shirts into school for the rest of the kids while they all go to the beach. We're getting close to RFID implants (under the skin) for kids. My dogs are all chipped. Kids are next probably.