" People.” I pause for a moment. “Remind me of Peel’s Principles of Policing, again?” Ramona looks blank. Mhari looks skeptical. “Policing by consent,” I hint. “Come on, the basic rules we play by? Minimum use of force to achieve compliance, the performance of a police force is judged best by how little crime takes place on their watch rather than by how many heads they kick in, that kind of thing? "

― Charles Stross , The Annihilation Score (Laundry Files, #6)