Oliver Wendell Holmes, Jr., United States v. Jin Fuey Moy…
“ If we could know judicially that no opium is produced in the United States, the difficulties in this case would be less; but we hardly are warranted in that assumption when the act itself purports to deal with those who produce it. § 1. Congress, at all events, contemplated production in the United States, and therefore the act must be construed on the hypothesis that it takes place. If opium is produced in any of the states, obviously the gravest question of power would be raised by an attempt of Congress to make possession of such opium a crime. ”
