David Josiah Brewer,
Davis v. United States (165 U.S. 373…
“ This court was of opinion that this was not the correct rule of law; that, while it was true that every man is presumed to be sane, yet whenever, by the testimony, the question of insanity is raised, then the fact of sanity, as any other essential fact in the case, must be established to the satisfaction of the jury beyond a reasonable doubt. ”
