Did you see this story about a school in California that requires students to wear radio transmitters? The idea is that it makes it simpler to track where kids are while they're at school.
While there are several reasonable objections by parents and lawyers to making kids wear these, I am also wondering what the school really gains in all of this. In my experience, it's not much of a problem to figure out where kids are once you get them in the building. Problems arise when kids are between home and campus---or skip school all together. It doesn't seem like these radio transmitters are going to solve any of that. Meanwhile, as a teacher, having one more impediment to taking attendance (such as a handheld device for logging kids and "beaming" reports) would really be unwelcome.