Actually, thinking about this, I'd assumed the drones must be autonomous or controlled via cellular networks, to make them harder to trace or jam. But now I'm

Actually, thinking about this, I'd assumed the drones must be autonomous or controlled via cellular networks, to make them harder to trace or jam. But now I'm thinking they're being controlled via more standard remote frequencies, and they're being left there while the authorities home in on them. That's the only explanation I can come up with for not having taken them out by now.