Police DFR programs involve a fleet of drones, which can range in number from four or five to hundreds. In response to 911 calls and other law enforcement calls for service, a camera-equipped drone is launched from a regular base (like the police station roof) to get to the incident first, giving responding officers a view of the scene before they arrive. In theory and in marketing materials, the advance view from the drone will help officers understand the situation more thoroughly before they get there, better preparing them for the scene and assisting them in things such as locating wanted or missing individuals more quickly. Police call this "situational awareness."

In practice, law enforcement's desire to get "a view of the scene" becomes a justification for over-surveilling neighborhoods that produce more 911 calls and for collecting information on anyone who happens to be in the drone's path. For example, a drone responding to a vandalism case may capture video footage of everyone it passes along the way. Also, drones are subject to the same mission-creep issues that already plague other police tools designed to record the public; what is pitched as a solution to violent crime can quickly become a tool for policing homelessness or low-level infractions that otherwise wouldn't merit police resources.

With their birds-eye view, drones can observe individuals in previously private and constitutionally protected spaces, like their backyards, roofs, and even through home windows. And they can capture crowds of people, like protestors and other peaceful gatherers exercising their First Amendment rights. Drones can be equipped with cameras, thermal imaging, microphones, license plate readers, face recognition, mapping technology, cell-site simulators, weapons, and other payloads. Proliferation of these devices enables state surveillance even for routine operations and in response to innocuous calls —situations unrelated to the original concerns of terrorism or violent crime originally used to justify their adoption.