Melville Fuller,
Patapsco Guano Company v. Board of Agriculture of North Carolina…
“ The right to make inspection laws is not granted to congress, but is reserved to the states; but it is subject to the paramount right of congress to regulate commerce with foreign nations, and among the several states; and if any state, as a means of carrying out and executing its inspection laws, imposes any duty or impost on imports or exports, such impost or duty is void if it exceeds what is absolutely necessary for executing such inspection laws. How the question whether a duty is excessive or not is to be decided may be doubtful. ”
