Perhaps a high speed drone could do this. The trick would be to deploy something like this safely. That said, I'm not looking forward to the day where drones an

Perhaps a high speed drone could do this. The trick would be to deploy something like this safely. That said, I'm not looking forward to the day where drones and AI are part of the standard kit used by police forces. The ability to cheaply surveil people clandestinely as they go about their business does not sound like a future to look forward to.