Was at my homeowner association's community field flying one of my solos. It's a fairly large field with woods and open grass stretches. I was standing next to the street focusing on my Solo in the air when I hear a voice from behind me saying, "you wouldn't believe, but someone complained about you spying on them." I turned around and it was a deputy sheriff in his unmarked patrol car. I sort of chuckled and asked if it was one of my neighbors. "An anonymous citizen," he replied. I talked to him for a few minutes while I continued to fly. I told him I flew in the community field just so I wasn't over my neighbors' houses. He agreed, but said some people believe they have a right to control the airspace above their yards. He was totally cool about it. I think the only reason he even talked to me about it was so that if anyone called in again he could reply that he "addressed" the issue. Kind of reinforces the notion that there are a lot of people out there who just can't stand the idea of anyone flying drones, and it highlights that the police are becoming more savvy about people flying UAVs.