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How long will it be before we have autonomous drones, downsized to softball size, making use of facial recognition? What will the defense be against sixty of them?”

No problem. Hi output broadband radio jamming. I have noticed that when they are testing drones, (Military Base nearby and my curiosity) their control signals are easily picked up on a Spectrum Analyser.

Maybe they should ban people with Electronic Engineering degrees from accessing amateur radio supplies? The down side is that even they lose the ability to target, they’ll still fall somewhere, though possibly not armed.