case11 min read (2,139 words)

Arizona v. United States (2012)

Citation: 567 U.S. 387 (2012) Court: Supreme Court of the United States Author: Justice Anthony Kennedy, for a 5-3 majority (Justice Kagan recused; Scalia, Thomas, and Alito each wrote separate dissents)

Parties

The State of Arizona — which in April 2010 enacted Senate Bill 1070, "Support Our Law Enforcement and Safe Neighborhoods Act." The law created new state-level immigration offenses and expanded the immigration-enforcement duties of Arizona state and local law enforcement. Governor Jan Brewer signed the bill on April 23, 2010; it was scheduled to take effect on July 29, 2010.

The United States — which on July 6, 2010, filed a lawsuit in the US District Court for the District of Arizona seeking to enjoin four specific provisions of SB 1070 on the grounds that federal immigration law preempted them. The federal government's legal argument was structural: immigration enforcement is an area where federal authority is pervasive, and state laws that attempt parallel enforcement interfere with the federal regime.

The case arrived at the Supreme Court by way of a preliminary injunction issued by District Judge Susan Bolton, affirmed by the Ninth Circuit Court of Appeals. Arizona appealed, seeking to enforce the enjoined provisions.

Facts

SB 1070 was the culmination of a multi-year Arizona legislative effort to expand state immigration enforcement in the face of what state officials characterized as federal non-enforcement of immigration laws. The law had four provisions that the federal government specifically challenged:

Section 2(B) — required state and local law enforcement officers, during a lawful stop, detention, or arrest, to make a reasonable attempt to determine the immigration status of any person "reasonably suspected" to be in the United States unlawfully. This became known as the "show your papers" provision.

Section 3 — made it a state-law misdemeanor for an unlawfully present immigrant to fail to register with the federal government and carry federal registration documents. The federal offense of failure to register already existed; Section 3 created a parallel state-level offense with distinct penalties.

Section 5(C) — made it a state-law misdemeanor for an unlawfully present immigrant to seek employment or to work in Arizona. Federal immigration law penalized employers for hiring unauthorized workers but did not criminalize the workers themselves; Section 5(C) created a state-law crime with no federal analog.

Section 6 — authorized state and local law enforcement to arrest, without a warrant, any person reasonably believed to have committed an offense that would make them removable from the United States. Federal immigration law treats removability as a civil matter; Section 6 authorized state officers to arrest on the basis of their own assessment of federal removability status.

The federal government's challenge framed SB 1070 as an intrusion on an area of federal supremacy. The Supreme Court granted certiorari to resolve the preemption questions and to clarify the relationship between state and federal immigration enforcement.

Question presented

Whether Sections 2(B), 3, 5(C), and 6 of Arizona Senate Bill 1070 are preempted by federal immigration law.

Holding

Sections 3, 5(C), and 6 are preempted. Section 2(B) is not facially preempted, but the Court's decision expressly left open future as-applied challenges.

The Court struck down three of the four challenged provisions:

The decision was 5-3. Justice Kennedy wrote for a majority that included Chief Justice Roberts, Justice Ginsburg, Justice Breyer, and Justice Sotomayor. Justice Scalia wrote a dissent; Justice Thomas wrote a separate dissent; Justice Alito wrote a third dissent that joined portions of the majority and portions of Thomas's dissent. Justice Kagan was recused because of her prior service as Solicitor General during the case's early stages.

Reasoning

Justice Kennedy's majority opinion proceeds through the preemption analysis in sequence. The federal preemption doctrine recognizes three categories: express preemption (federal statute explicitly displaces state law), field preemption (federal regulation is so pervasive that Congress has occupied the field), and conflict preemption (state law makes compliance with federal law impossible, or obstructs federal purposes). The majority applied all three.

Field preemption on Section 3. Federal alien-registration law, codified at 8 U.S.C. §§ 1301–1306, creates a "full set of standards" governing alien registration (567 U.S. at 400). The Court held that Congress had occupied the field of alien registration, and state parallel offenses — even if they mirror the federal scheme exactly — interfere with the federal regime by permitting state-level variation in penalties and enforcement. The analysis tracked Hines v. Davidowitz, 312 U.S. 52 (1941), the classic field-preemption case on state alien-registration laws.

Conflict preemption on Section 5(C). The Court examined the Immigration Reform and Control Act of 1986 (IRCA) and found that Congress had deliberately chosen to sanction employers who hire unauthorized workers without also criminalizing the workers' own conduct in seeking employment. This was not an oversight; the legislative history confirms it was a considered policy balance. A state law that criminalizes the workers' conduct stands as an obstacle to Congress's chosen policy and is therefore preempted under Hines conflict-preemption analysis. At 567 U.S. at 405: "The correct instruction to draw from the text, structure, and history of IRCA is that Congress decided it would be inappropriate to impose criminal penalties on aliens who seek, or engage in, unauthorized employment."

Conflict preemption on Section 6. The Court analyzed the federal removal regime, which it described as depending on "discretion and coordination" between federal agencies (567 U.S. at 407). State officers making unilateral determinations of removability and effecting warrantless arrests on that basis would interfere with federal discretionary judgments about enforcement priorities. The analysis drew on Chamber of Commerce v. Whiting, 563 U.S. 582 (2011), and on the long line of cases recognizing that federal executive-branch discretion in immigration enforcement is itself a federal policy that state law cannot supersede.

Section 2(B) held not facially preempted. The Court declined to strike down the "show your papers" provision on its face. The majority reasoned that state law enforcement's communication with federal immigration authorities during the course of a lawful stop is not, in itself, inconsistent with federal immigration regime. Section 8 U.S.C. § 1357(g) explicitly authorizes such communication. The Court's holding was narrow: Section 2(B) survives facial challenge, but the specific applications — how state officers implement the provision, whether they prolong detentions, whether they use ethnic profiling — remain subject to as-applied constitutional challenges (Fourth Amendment, equal protection, due process).

Dissent

Justice Scalia's dissent argued that the majority's preemption analysis gave insufficient weight to state sovereignty in immigration enforcement. Scalia's position was rooted in a theory of concurrent state authority: because the states existed before the federal government, and because states have historically exercised authority over persons within their borders, Congress's preemption of that authority should be narrowly construed. Scalia wrote that Arizona's sovereignty "is not the sovereignty of a child" subject to federal correction; the state can enact its own immigration enforcement regime in parallel with federal enforcement. The dissent drew on originalist readings of the pre-ratification state immigration practice.

Justice Thomas's dissent agreed with Scalia on the structural point and added that the majority's application of field-preemption and conflict-preemption doctrines was too expansive. Thomas would have upheld all four challenged provisions.

Justice Alito's dissent was mixed. He agreed with the majority that Section 3 was preempted but disagreed on Sections 5(C) and 6. His analysis was more fact-specific than the Scalia and Thomas dissents; he would have found that Section 5(C) criminalizes conduct Congress had considered but declined to address, leaving room for state action, and that Section 6's warrantless-arrest authority was within historical state police powers.

Significance

Arizona v. United States is the most significant Supreme Court decision on federal-state immigration enforcement in decades. Its core doctrinal holdings — that federal alien-registration law preempts state parallel offenses, that federal employment-sanctions law preempts state criminalization of unauthorized work, and that federal removal-discretion regimes preempt state warrantless-arrest authority — constrain the range of immigration-enforcement actions states can undertake.

The decision also settled, at least for the decade following it, the legal viability of the "omnibus immigration enforcement" laws that had proliferated across Arizona, Alabama, Georgia, and other states between 2006 and 2011. Each of those states had enacted measures modeled on or related to Arizona's SB 1070; Arizona v. United States's preemption holdings functionally struck down comparable provisions in those other states' laws. Subsequent federal litigation over Alabama's HB 56, Georgia's HB 87, Utah's HB 497, and related state measures followed Arizona v. United States closely.

The case left Section 2(B) — the "show your papers" provision — on the books as a matter of facial constitutionality, but subsequent as-applied litigation in Arizona and elsewhere has narrowed its operational scope. Racial profiling concerns under the Fourth Amendment and equal-protection clause, coupled with prolonged-detention concerns, have constrained how Section 2(B) is implemented in practice. The provision's practical effect has been much smaller than its textual authorization would suggest.

More broadly, Arizona v. United States is an important preemption case cited across subject-matter boundaries. Its distinction between field preemption and conflict preemption, and its careful attention to congressional policy choices as evidence of deliberate preemption, inform preemption analysis in other domains (banking, environmental, employment, data privacy). Constitutional-law scholars and practitioners cite the opinion for its methodical framework even when the subject matter is unrelated to immigration.

For Arizona specifically, the case is one of two Supreme Court decisions where Arizona state law has been the subject of significant federal constitutional adjudication (the other being Miranda v. Arizona in 1966; see cases/miranda_v_arizona.md). The two decisions together give Arizona an outsized presence in American constitutional law relative to its population — Arizona is the only state that has generated two cases whose names appear in every introductory constitutional-law casebook.

Later citations

Sources

Full citations in sources/citation_index.md under Arizona v. United States.