Joseph McKenna, United States v. Antikamnia Chemical Company…
“ It is not necessary to enter upon the challenged ground. The law furnishes its own tests of what the labels should reveal, and we may grant, for the argument's sake, as contended, that it has penal character; but this does not mean that it should not be given its reasonable intendment. There is no hardship in this, either to the manufacturer or the seller of drugs. They surely know what they make or vend,-know whether it is primary or of what a derivative, and the law requires only that they put their knowledge on the labels for the information of purchasers. ”
