Over the course of their time in the city, the agents have adapted ways to disguise themselves, switching from large S.U.V.s with tinted windows to less conspicuous vehicles; they apparently used one convoy as a decoy to lure observers away from a location as other agents arrived to carry out an arrest. Cheung has also documented the haphazard quality of the operation, as in one photograph showing a gun magazine left in the snow after agents departed from a scene.