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Rosa Brooks, a professor at Georgetown Law, has spent much of her career observing the relationship between violence and law enforcement. She has worked in the State Department and at the Pentagon, and has taught courses on international law and national security. In 2016, Brooks published “How Everything Became War and the Military Became Everything,” an examination of the military’s outsized role in the execution of American foreign policy. Five years ago, Brooks decided to train as a reserve police officer in Washington, D.C. She participated in training courses, and, from 2016 to 2020, patrolled the District of Columbia for twenty-four hours each month. Her new book, “Tangled Up In Blue,” documents her time as a reserve officer, and presents a larger critique of contemporary policing. Brooks is particularly interested in the ways that cops are trained to anticipate violence. “The chief lesson learned at the academy,” she writes, is that �