In 2005 neurologist Dr Ian Maxwell cleared Mr Hempel to fly, but he said he was unaware of his history.
I recommended Mr Hemple consult Dr Maxwell after the same Doctor cleared me to fly, (after 8 years on non epalyptic incidence), and follow the same principle of time/and proof of non events. The simple fact was that I had a coma score of 13 + at all times and no documented loss of conscious ability.
Mr Hemple had a head injury that rendered him unconscious after his head was crushed in a large hangar door.
It would appear that Dr Maxwell was not privy to all the evidence.
I would suggest his protected status lay in his previous strange and documented activities which may have relevance to this incident if someone with the power was of a similar mind.