"It’s actually an outgrowth of a really wonderful medical technology, an automated doser for different crisis situations—antivenins for people in remote areas that have seriously toxic wildlife, that kind of thing. But that’s not really commercial, so the designers licensed it to the prison people and it’s really attractive to police forces. I mean, why wouldn’t it be? Imagine if you could just turn off a brawl or a riot from your phone." She mimes zapping me with a touchscreen.