https://youtu.be/ag42RP06G60
China National TV news introduced how MMC's commercial drones assist local police doing traffic management in Shanghai.
About different payloads for different purposes in patrol and emergency management:
http://www.rcindia.org/multirotors/what-are-your-anticipated-couple-of-multi-rotor-payloads/new/#new
Multirotors are the future of small scale aviation whether we like it or not.