Another data point: Domestic terrorist sniper firing from a hidden location? For several years law enforcement has had the technology right off the shelf to install microphones around a city (like on cell phone towers) that can triangulate a single gunshot to within a couple of feet in less than a second. So 2nd amendment fantasies about sniping from rooftops could get those snipers killed or caught very quickly.
Not many cities have installed them, but if that was perceived as a tactic it could be shut down immediately.
