“At one booth, two gray-haired men were selling a 300-pound ballistic whiteboard — adorned with adorable animal illustrations and pocked with five bullet holes … ‘What we want to do is just to give the kids, the teachers, a chance’ … ‘So they can buy a few minutes.'” WaPo: Armored school doors, bulletproof whiteboards and secret snipers. Billions are being spent to protect children from school shootings. Does any of it work?