You get them while they're sleeping.

[ As simple as that, he makes it sound, but then shakes his head. ]

Or you sedate them, find out when they're going in for surgery and get in while that's going on. Time in dreams is distorted, so you only need a window of five or ten minutes, usually, to do what you need to do.

People know it happens, though. A lot of people make money training people's minds to resist that kind of thing. Militarizing, we call it.