I expect when a president dies he is autopsied to make sure it was of "natural" causes. What about autopsying brains?

In the case of donjohnchump a brain autopsy should definitely be done. To see exactly what species he was and why his thought patterns were so screwy wacky weird queer peculiar bizarre. It would be good to know the why of the "brain" wouldn't it? Just for the halibut?