Drones could also serve law-enforcement in proactive ways by providing real-time intelligence about rapidly evolving situations such as mass shootings, hostage rescue operations and other high-risk missions. They could be especially valuable in coordinating search and rescue operations, monitoring hazmat incidents and directing first-responders confronted with emergencies such as fires, floods, traffic accidents and weather-related road closures. And like dashboard cameras in police cruisers and the tiny video devices worn on officers' uniforms, their presence would signal that routine interactions between officers and the public are being recorded. That, in turn, acts as a deterrent for citizens tempted to escalate a confrontation, but it's also a restraining element on the behavior of the police themselves. Complaints of excessive use of force by police drop dramatically when officers are wearing cameras.