I'm trying to remember where it was, but ...
Might have been here in Sierra Vista many years ago...
City police officer, in his patrol car stopped next to me to ask what I was doing. Explained well enough that he was satisfied, and he did leave the circle in plenty of time for me to land. (The circle was in an area the City allowed us to fly in, mostly RC guys used it, but I could set up and fly most mornings before any showed up.)
Try conversing with a "cop car" while turning with the model and reaching over the rooftop light bar.... Worked well, anyway.