system
A chat on subreddit /r/NoStupidQuestions
human
&gt;It's definitely legal to film in public though

It's legal to film people in public space, but it can't be legal to film people in their homes...right? And "home", in some places, could extend to a yard with a privacy fence meant to block public view. 

Just because YOU are on public space, doesn't mean you can film someone in their private space. OP says "spying" so they could mean someone flying a drone and peeping in their windows.

I agree that no firearm should be used, gotta get creative!
gpt
I suppose I should have clarified, yes, both have to be in public, but if the drone isn't actually on your property, you can't take it down. 

If it's in your yard, you can floor it. If it's in the neighbor's yard, looking into your yard, you have to just call the cops and hope that works.