> You're not really defending against competent malicious adults which plan everything in advance. > You're defending against angry teens who might decide on d

> You're not really defending against competent malicious adults which plan everything in advance. > You're defending against angry teens who might decide on doing it because one day something pushed them over an emotional edge. I thought these scanners were installed (at least originally) mainly because of stuff like gang violence. I'd think a gang member (in their way) would be more like a "rational actor." Also you'd have to differentiate the "smuggling a weapon" from "stabbing." The weapon smuggling part might be rational, but the stabbing itself be emotional and irrational.