Everyone here needs to fight against drone invasions, even if you have not yet been directly affected. Many local governments are working to use them to spy on tax payers, and some are already doing it. The courts do not have a unified stance on the matter, but I will happily argue it in any court. Some courts seem to think you cannot expect privacy because airplanes commonly fly over, but airplanes typically do not fly 100ft overhead, with high rez optics. That is a ridiculous claim. I don't think people understand the court system. There is a thing called evidence that is required. I have personally FORCED that evidence from my county, not due to drones, but another matter where they are obviously using high power optics to spy. They realized I was going to destroy them in court due to their invasion of privacy and harassment, and they dismissed.
We have been development anti drone munitions and tech. Even though the FAA tries to classify these as an aircraft, and you would be downing an aircraft, I would still take that challenge in any court. This would be little different than any 'stand your ground' or 'right to self defense' law. I would make that drone disappear. Get a warrant FROM A JUDGE to come look for it. One defense I see as reasonable is 'self defense'. These things can literally be loaded with weapons, you are scared of it! You thought it was an alien and you were going to die. Smartest approach is just like shooting someone.....shut your mouth until you discuss with your atty.
I would be willing to bet if one was spying in a backyard 20ft away and you drop it, not a single soul will come looking for it, because that in and of itself is proof of where it was operated. Some of these require an FAA license to fly, and if they get hammered for an illegal flight, they lose their license. OR, they have no license at all, which is likely illegal right there.
Either way, put them down! As to how, I will not hand out all my tech at the moment, but we are not working on a 12ga solution because of the way a firearm law is written. Compressed air is not considered a firearm, though I suspect legal pricks will work to change this. The discharge of such a device is NOT a firearm discharge currently.