Originally published in Law360, New York (June 25, 2012, 8:49 PM ET)

The U.S. Supreme Court's ruling that several portions of Arizona's controversial immigration law were preempted by federal law will likely stanch the proliferation of similar state-level legislation and spare employers the high costs of complying with a patchwork of state immigration statutes, attorneys say.

The high court on Monday held 5-3 that the federal government's power to regulate immigration trumped three of the four sections of Arizona's S.B. 1070 that had previously been blocked by the Ninth Circuit.

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