The famous Germanwings murder-suicide had some of this in play -- the pilot's doctor had given him a letter excusing him from work, due to a probable psychotic

The famous Germanwings murder-suicide had some of this in play -- the pilot's doctor had given him a letter excusing him from work, due to a probable psychotic episode, but the pilot chose not to share the letter with the airline and the doctor was forbidden by law from sharing it.