Case Law Index
federal2012
Additional Highlights:ImmigrationPreemptionSupremacy Clause
Arizona v. United States
United States Supreme Court
Key Holding
Federal immigration law preempts most of Arizona's state immigration enforcement law (S.B. 1070), though the "show me your papers" provision may stand.
Case Summary
Arizona v. United States struck down most of Arizona's immigration enforcement law on preemption grounds, holding that states cannot enact their own immigration enforcement schemes that conflict with or stand as obstacles to the comprehensive federal immigration system established by Congress.