During the TdA investigation in Aurora the feds brought in some rather advanced drones. A friend lived nearby and told me about what she saw. A couple blocks away someone magdumped a full auto AK while she was on the porch. Shortly thereafter, a drone zipped by at treetop level, no lights, very quiet, then apparently landed on a tree and latched onto a branch. I did some research into this and the tech for that exists, typically only used by scientists. Guessing they had multiple drones posted at various areas to monitor TdA vehicles fleeing the scene.