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8 L. Rev. 1133, 1153 (2010) (“[T]he Full Faith and Credit Clause is the more natural source for limitations on state extraterritorial powers because that clause at its core is concerned with extraterritoriality”); see also D. Laycock, Equal Citizens of Equal and Territorial States: The Constitutional Foundations of Choice of Law, 92 Colum. L. Rev. 249, 290, 296−301 (1992).

For example, the plaintiffs in this case say that Ohio law expressly authorizes pig farmers in Ohio to do precisely what California’s Proposition 12 forbids. Brief for Petitioners 30–31; see Ohio Admin. Code §§§ [sic]901:12−8−02(G)(4), (5) (2011). If so, the Full Faith and Credit Clause might preclude California from enacting conflicting regulations on Ohio pig farmers.

Once again, I express no view on whether such an argument ultimately would succeed. But the question deserves further examination in a future case.

As I understand it, the controlling plurality of the Court (reflected in Part IV–C of ’s opinion) today rejects the plaintiffs’ dormant Commerce Clause challenge on the ground that the plaintiffs’ complaint does not sufficiently allege that the California law at issue here imposes a substantial burden on interstate commerce under Pike. See (plurality opinion);  (opinion of ). It appears, therefore, that properly pled dormant Commerce Clause challenges under Pike to laws like California’s Proposition 12 (or even to Proposition 12 itself) could succeed in the future—or at least survive past the motion-to-dismiss stage. Regardless, it will be important in future cases to consider that state laws like Proposition 12 also may raise substantial constitutional questions under the Import-Export Clause, the Privileges and Immunities Clause, and the Full Faith and Credit Clause.