system
A chat on subreddit /r/NoStupidQuestions
human
If it's on your property, it's not always illegal to take it down. You own like 50 feet of airspace above your land. 

It's definitely legal to film in *public* though, and there isn't anything you can do about it. 

But if it's your backyard you actually can take it down sometimes as long as you use a legal method (for example, you can't shoot it down in California in basically any situation, but you can use a butterfly net if you can catch it).

Also, I've literally won this case, see a comment below for more details. Feel free to tell me you Googled it and think I'm wrong, but that doesn't make you right. Also, *it's not always illegal* does not mean "do whatever you want". *Some* drones are classified as aircraft, but not all of them.
gpt
&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!