[1]https://www.cityam.com/wp-content/uploads/2019/11/Cityam-2019-11-12.
   pdf
   "One final warning, though, which is not about ethics but
   practicalities. Cheap assassination drones already exist on the
   battlefield, but as automated weapon technology develops, we may find
   them being used elsewhere. Are we really prepared for small drones with
   guns that can look into the windows of Downing Street, or Buckingham
   Palace? The history of military technology shows that it cannot be kept
   out of private hands, but we have to hope that killer robots are an
   exception."

References

   1. https://www.cityam.com/wp-content/uploads/2019/11/Cityam-2019-11-12.pdf