I've sometimes toyed with a getting a small Arducopter, Joe. Something that could fly its own "missions".

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I don't know about banning them. There is open source control software including autopilots, parts readily available and probably 3d printing plans, etc. ...he, here's some

You'd probably inconvenience a lot of (I'd assume) mostly harmless casual users but I doubt you would be stopping anyone determined to disrupt?