Page:NPPC v. Ross.pdf/2

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(b) Given petitioners’ concession that Proposition 12 does not implicate the antidiscrimination principle, petitioners first invoke what they call the “extraterritoriality doctrine.” They contend that the Court’s dormant Commerce Clause cases suggest an additional and “almost per se” rule forbidding enforcement of state laws that have the “practical effect of controlling commerce outside the State,” even when those laws do not purposely discriminate against out-of-state interests.