We got fingerscan ID'd on the way into Disneyland, on the way into seaworld they fingerscanned my 5 and 7 year old kids. Security I guess. I've already forgotten the first part of what you said, if it's to get into school or just to access lunches etc. remember that schools have to be sooooo careful with you that anything they're doing for your safety is a good thing. At a guess, it its logging people in and out of parts of the school then it will be also used for the fire register.