Today I was flying at a park I have flown at numerous times. Arriving me and my daughter notice a few people out in the far baseball field (the red circle in pic). Today I just flew using Active Track and had the Mavic follow my daughter on her bike while she tried to out run it. Was in the air only a few minutes when I heard a car pulling up, turned to look and it was a State Trooper (yeah not our local sheriff deputies). He gets out, says how are you, can I talk with you, can you land your drone, you have ID routine. I give him my ID and then land. Some small talk going on as well once he saw it. He explains to me that even though there is no rules about flying at the park as its a public park, and the airport is about 8miles away, the FAA has rules about flying over people. Thats why he was here. A complaint came to them about an individual flying a drone over kids, and adults while a large family was having a picnic (was actually 12 people) I looked right at his eyes and asked, are you sure you're at the right park? He gave me a not so loving face. I then assured him I hadn't flown over anyone. He drives around to the "family" about 10 minutes later he returns to explain how she is very worried, concerned and are insisting he makes me leave because the woman had asked me to stop flying over them and I've been flying within only 10' of there heads at times. I say sir, I haven't flown over anyone, I explained active track to him while he shakes his head yes, he goes well if you don't mind, since thats a DJI, can I see your flight log in the your flight app? I open the DJI Go4 goto flight logs and goes right to today. He looks at it, says Mr., can I take a picture of your tablet? He does, then he says I apologize and I appreciate your time, and politeness with me. I need to go talk to someone about lying to an office of the law. Can you wait until I am done with her? He comes back and explains to me it was really just one woman that was doing all the complaining, even through out the whole privacy thing, he said he showed her the flight log explained how much technology is on these high end drones. She changed her complaints to well I was just worried about what he could do with the drone. He claimed he owns drones but didn't say what. Thank goodness for the flight log...sorry for it being so long. He is a pic of the FL, when I drew on it I cropped it somehow.