There has been no credible evidence, the only drone flying with any certainty was the Police Force drone or drones. The supposed drone seemed to have battery technology unknown to mankind. The whole situation just didn't make any sense at all, except maybe to pilots. Pilots could be replaced entirely by automated flights, remotely controlled from almost anywherein the world, the technology already exists, I watched pilotless jets taking off from the airfield near shell island 50 years ago and military drone aircraft can pinpoint laser bombs on Iraqi bridges almost at will. Wouldn't it be convenient to raise a scare to enure pilots were perceived as indespensible, or am I being too cynical. Tesco bag anyone....