New Jersey Enacts Law Limiting Police Cooperation with Immigration Authorities

On March 23, 2026, the New Jersey Legislature approved three immigration-related bills in divided votes, sending them to Governor Mikie Sherrill's desk. The centerpiece measure would codify the state's Immigrant Trust Directive — an executive policy first issued in 2018 that restricts when local and state police can cooperate with federal immigration authorities [1]. The Senate passed the bill 22-13, and the Assembly approved it 50-21 [2]. Sherrill has said she intends to sign all three bills [2].

The legislation arrives at a moment of maximum tension between the Garden State and the Trump administration. The Department of Justice sued New Jersey on February 24, 2026, over Governor Sherrill's Executive Order No. 12, which bars ICE from entering nonpublic areas of state property without a judicial warrant [3]. Attorney General Pamela Bondi accused the state of maintaining policies "designed to obstruct and endanger law enforcement" [3].

The stakes are concrete: ICE arrests in New Jersey surged 110% between 2024 and 2025 — from 1,526 arrests between January and July 2024 to 3,201 in the same period of 2025 [4]. By the end of 2024, ICE agents had arrested 2,959 people in the state [4]. The legislation now moving through Trenton will determine the ground rules for how 38,000 state and local law enforcement officers interact with those federal operations.

What the Legislation Does — and Doesn't Do

The three-bill package addresses distinct aspects of the relationship between state institutions and federal immigration enforcement.

Bill S3521 — Codifying the Immigrant Trust Directive: This is the most consequential measure. It writes into statute the Attorney General's 2018 directive distinguishing between state and local law enforcement's role in enforcing criminal law and ICE's role in civil immigration enforcement [5]. Under the bill, state and local officers cannot stop, question, or detain individuals solely based on immigration status; ask about immigration status unless directly relevant to a criminal investigation; honor ICE detainer requests without a judicial warrant; or participate in federal civil immigration enforcement operations [6].

The bill does not create an absolute wall between police and ICE. Officers can still enforce state criminal law — if someone is arrested for a crime, that arrest proceeds regardless of immigration status. Police can notify federal agencies about operations for public safety coordination [7]. The legislation does not prevent information-sharing through existing criminal databases like the National Crime Information Center (NCIC).

Bill S3522 — The Privacy Protection Act: This measure limits data collection and sharing by healthcare agencies and government entities to prevent residents from avoiding medical care, shelters, or food assistance out of fear that their information will reach immigration authorities [7].

Bill S3523 — Identity Disclosure Requirements: This bill restricts law enforcement officers — including federal agents — from concealing their identities while conducting official duties in New Jersey, a direct response to reports of ICE agents wearing masks during enforcement operations in the state [8].

Penalties for violations remain an area where the legislation is less specific than advocates had hoped. Enforcement would fall primarily to the Attorney General's office, which would have authority to investigate complaints and take action against agencies that violate the law's provisions.

The Detainer Problem: A Decade of Data

The debate over ICE cooperation in New Jersey has a long statistical trail. Between ICE's formation in 2003 and April 2018, the agency issued 36,290 detainer requests to New Jersey county jails [9]. Over 34,000 of the immigrants held on those detainers were kept in custody longer than the 48 hours legally permitted — more than nine out of ten cases [9].

Between October 2011 and August 2013 alone, New Jersey county jails received at least 5,844 detainer requests. Nearly two-thirds were lodged against individuals who had not been convicted of any offense [9].

The financial burden has been substantial. The New Jersey Policy Perspective estimated that immigrants held on ICE detainers were incarcerated an average of 24 days past their scheduled release date, translating to roughly $139 million in costs to local law enforcement over the preceding decade [10].

Source: Deportation Data Project / Jersey Bee

Data as of Oct 20, 2025CSV

The cooperation landscape has been uneven across the state's 21 counties. As of recent reporting, 19 of 21 New Jersey counties honored warrantless ICE detainer requests. Only Burlington and Union Counties declined. Middlesex and Ocean Counties honored requests in limited situations [9]. The ACLU of New Jersey has urged all counties to stop honoring detainer requests, citing federal court rulings that local authorities — not ICE — bear legal liability for constitutional violations resulting from extended detention [11].

The Unauthorized Population

Precise counts of unauthorized immigrants do not exist — the Census Bureau does not ask about immigration status — but the Migration Policy Institute estimated approximately 498,000 unauthorized immigrants resided in New Jersey as of its most recent comprehensive analysis [12]. The highest concentrations are in counties near New York City, with the top counties of origin including India, Mexico, Guatemala, El Salvador, and Ecuador [13].

New Jersey's immigrant population is deeply integrated into the state economy. The American Immigration Council has documented that immigrants account for a significant share of the state's workforce, tax revenue, and consumer spending [14].

The Federal Lawsuit and Constitutional Questions

The DOJ's February 2026 lawsuit against New Jersey targets Governor Sherrill's Executive Order No. 12 specifically, but the legal arguments extend to the broader legislative package now awaiting her signature [3].

The federal government's core claim is that New Jersey's restrictions on ICE access to state correctional facilities and law enforcement cooperation impede federal immigration enforcement. The complaint alleges that "New Jersey's refusal to cooperate with federal immigration authorities results in the release of dangerous criminals from police custody who would otherwise be subject to removal," citing individuals convicted of aggravated assault, burglary, and drug and human trafficking [3].

The constitutional question centers on the Tenth Amendment's anti-commandeering doctrine — the principle that the federal government cannot compel state and local officials to enforce federal law. Multiple federal courts have upheld this principle in the immigration context. The Supreme Court's 2018 decision in Murphy v. NCAA reinforced anti-commandeering as a structural limit on federal power [15].

However, the federal government has additional tools. Attorney General Bondi's office has signaled a willingness to challenge sanctuary policies under the Supremacy Clause, arguing that state laws cannot "obstruct" federal operations even if they don't affirmatively require cooperation [3]. Several prior rulings have held that the federal government cannot use spending powers or withhold funds to coerce compliance with immigration enforcement [16].

On the question of federal funding risk, the picture is complex. Previous attempts by the Trump administration to strip federal grants from sanctuary jurisdictions were largely blocked by courts during the first term. The current Justice Department appears to be pursuing litigation rather than funding threats as its primary strategy, though the legal landscape continues to shift [16].

What Happened in California and Illinois

New Jersey is not breaking new ground. California enacted SB 54, the California Values Act, in 2017, establishing statewide restrictions on local law enforcement cooperation with ICE [17]. The law's impact has been studied extensively.

A peer-reviewed 2020 study by researchers at the University of California, Irvine found "no increase in crime under California's sanctuary state status." The researchers used a synthetic control methodology, comparing California's crime trends against a weighted combination of states without similar policies. "SB 54's impact on violent crime was null," lead researcher Charis Kubrin concluded [18].

A study published in the Proceedings of the National Academy of Sciences found that "sanctuary policies reduce deportations without increasing crime" [19]. Separate research published in the Journal of Urban Economics found no crime increase in cities that adopted sanctuary policies [20].

The academic consensus is notably one-directional. Multiple studies since 2017 have either found no measurable effect on crime or found marginally lower crime rates in sanctuary jurisdictions. One analysis found 35.5 fewer crimes per 10,000 people in counties that decline ICE detainers compared to counties that honor them [21].

Critics of these studies argue that statewide analyses may obscure local variation. The UC Irvine researchers acknowledged this limitation: while the net statewide impact appeared null, "the experiences of local communities may vary considerably" [18].

Cases That Drove the Legislation

Several documented incidents contributed to legislative momentum in New Jersey.

The case of Ernesto Galarza became a landmark. Galarza, a U.S. citizen born in New Jersey, was arrested during a drug sweep at his workplace in 2008 and later acquitted. Despite having his Pennsylvania driver's license and Social Security card on his person, a local police detective reported his arrest to ICE, alleging he was undocumented — a suspicion Galarza contended was racially motivated. The resulting Third Circuit case (Galarza v. Szalczyk, 2014) led to a nearly $100,000 settlement paid by Lehigh County, Pennsylvania, for unlawful detention [22].

The ACLU of New Jersey has documented conditions at the state's immigrant detention facilities — including the Elizabeth Detention Center operated by CoreCivic, and county jails in Bergen, Essex, and Hudson Counties — citing unsanitary conditions and medical neglect [23].

Immigrant advocacy organizations, including the New Jersey Alliance for Immigrant Justice, characterized the legislation's passage as a "hard-earned victory for efforts to free ourselves from the tyranny of mass detention and deportation," in the words of executive director Amy Torres [7].

The Public Safety Counterargument

Opponents of the legislation have been forceful. State Senate Republican Leader Tony Bucco warned that prohibiting law enforcement communication with ICE "would hurt public safety" [7].

The Department of Homeland Security has publicized individual cases to pressure sanctuary jurisdictions. In March 2026, DHS issued a press release about a specific case in New Jersey involving an individual accused of assaulting a minor, framing it as a consequence of sanctuary policies [24].

ICE argues that when local jails release individuals subject to detainer requests, federal agents must conduct at-large arrests in communities — operations that are more resource-intensive and present greater safety risks to agents and bystanders than secure transfers from custody [25].

Supporters of the legislation respond to public safety concerns on multiple levels. They point to the academic research showing no crime increase in sanctuary jurisdictions. They argue that cooperation with ICE deters immigrant communities from reporting crimes and cooperating as witnesses, creating a net negative for public safety. And they note that the legislation makes exceptions — police can still arrest anyone committing a crime, and serious criminal convictions typically trigger separate federal processes [19][21].

Enforcement Gaps and Remaining Questions

The legislation applies to state police, county sheriffs, and municipal departments alike. But several enforcement questions remain.

First, while New Jersey abolished its 287(g) agreements — which had deputized local officers as federal immigration agents — the federal government continues to seek new 287(g) partnerships nationwide [26]. Senator Cory Booker has introduced federal legislation to rescind the program entirely, arguing that "immigration enforcement should not be delegated to state and local police departments" [27].

Second, the bills do not prevent information-sharing through federal criminal databases. If an individual's immigration status appears in the NCIC or other law enforcement databases, that information remains accessible. Immigrant advocates have identified this as a potential gap that could allow de facto cooperation to continue through existing infrastructure [10].

Third, the distinction between criminal law enforcement and civil immigration enforcement can blur in practice. Joint task forces focused on drug trafficking, human smuggling, or organized crime may involve both criminal and immigration components. The legislation permits criminal law enforcement cooperation but restricts civil immigration enforcement — a line that individual officers will have to navigate case by case.

Source: Bureau of Labor Statistics

Data as of Mar 24, 2026CSV

What Comes Next

Governor Sherrill's spokesperson confirmed she "is committed to protecting constitutional rights and public safety in New Jersey, and intends to sign this legislation in the near future" [2]. Once signed, the law would make New Jersey one of the largest states by population to codify sanctuary protections at the statutory level, joining California, Illinois, and Colorado.

The DOJ lawsuit will proceed regardless. Federal courts in New Jersey will weigh the anti-commandeering doctrine against the government's Supremacy Clause arguments — a legal contest that could reach the Third Circuit Court of Appeals and, potentially, the Supreme Court.

The political dimension is equally charged. New Jersey's 2025 gubernatorial race saw immigration emerge as a central issue, and Sherrill's willingness to sign the legislation signals that Democrats in the state view the issue as favorable political terrain, even as national polls show public opinion on immigration enforcement is divided [28].

For the estimated 498,000 unauthorized immigrants living in New Jersey [12], the practical effects will depend on how consistently local agencies comply with the new law, how aggressively the Attorney General's office enforces it, and whether federal courts ultimately sustain or strike down the state's authority to set these boundaries.

The confrontation between Trenton and Washington is, at bottom, a question that has recurred throughout American federalism: when the federal government wants state cooperation and the state refuses, who prevails? The answer, as it has been since the founding, will be determined in court.