Summary

Pierce Butler Di Santo v. Commonwealth of Pennsylvania…

But the doctrine of stare decisis does not command that we err again when we have occasion to pass upon a different statute. In the search for truth through the slow process of inclusion and exclusion, involving trial and error, it behooves us to reject, as guides, the decisions upon such questions which prove to have been mistaken. This course seems to me imperative when, as here, the decision to be made involves the delicate adjustment of conflicting claims of the federal government and the states to regulate commerce.
Source: Wikisource

Pierce Butler Di Santo v. Commonwealth of Pennsylvania…

It would involve merely refusal to repeat an error once made in applying a rule of law-an error which has already proved misleading as a precedent. While the question whether a particular statute has the effect of burdening interstate or foreign commerce directly presents always a question of law, the determination upon which the validity or invalidity of the statute depends is largely or wholly one of fact. The rule of law which governs the McCall Case and the one at bar is the same. It is that a State may not obstruct, discriminate against or directly burden interstate or foreign commerce.
Source: Wikisource

Pierce Butler Di Santo v. Commonwealth of Pennsylvania…

And obviously, also, this is not a case in which the silence of Congress can be interpreted as a prohibition of state action-as a declaration that in the sale of ocean steamship tickets fraud may be practiced without let or hindrance. If Pennsylvania must submit to seeing its citizens defrauded, it is not because Congress has so willed, but because the Constitution so commands.
Source: Wikisource

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