Joseph McKenna, McGinis v. California — Opinion of the Court
“ A series of instructions were asked by defendants to be given which expressed the supremacy of Congress over interstate and foreign commerce and that therefore, even if defendants had control of the opium, if it was in transit or being transported from the United States to Mexico through a chain of carriers, then the defendants did not have possession of the opium in violation of the law of the State, and that it was the duty of the jury to acquit them. ”
