The school shooting industry is worth billions — and it keeps growing. “Tom McDermott, with the metal detector manufacturer CEIA USA, says schools used to be a small fraction of their U.S. business. Now they’re the majority. ‘It’s not right. We need to solve this problem. It’s good for business, but we don’t need to be selling to schools,’ McDermott says. Sarah McNeeley, a sales manager with SAM Medical, is selling trauma kits, which include tourniquets, clotting agents and chest seals. She says their customers are traditionally EMTs, fire departments and military medics, but increasingly, school districts.”