Lets say you get all your paperwork in good shape and have everything setup to film the city (or another scenic location) from a drone. How do you then ensure that the local police officers don't constantly come up to you and demand to see your paperwork, making it difficult to operate without interruptions?

I can imagine this being somewhat doable if you have an assistant but what about solo drone operators? Do they call the non-emergency police line and ask an officer to stay with them onsite? Do they put the permits up on a plaque before initiating the flight?