This story points out few things. First, this is a failure of parenting. He should have demanded his kids surrender their devices every evening. Did he not want the "conflict"? Dads had more backbone, when I was growing up.

Second, I think there should be licensed use available for low power jammers -- say, one that ranged only so far as the perimeter of a high school classroom. If that's not possible, then perhaps schools need to be refitted with chickenwire in the walls, like the old plaster walls of years ago.