This page is information, not legal advice. Wisconsin's enforcement landscape is in active legal flux. As of mid-2026: 13 agencies have 287(g) agreements, up from zero before 2025. Milwaukee and Madison police have explicitly declined to cooperate with ICE on civil immigration enforcement. Dane County Sheriff stopped honoring detainers. The Wisconsin Supreme Court accepted an ACLU/Voces de la Frontera lawsuit in December 2025 challenging whether sheriffs have any authority to hold people on ICE civil detainers under state law - the case was sent back to the state Supreme Court in May 2026 after sheriffs attempted to move it to federal court, and a decision may come in 2026. ICE detainees are transferred to Chicago. Verify current conditions with Voces de la Frontera or the ACLU of Wisconsin.
Wisconsin had zero 287(g) agreements before 2025 and reached 13 by June 2025, with all the growth occurring under the second Trump administration. The state's enforcement landscape is genuinely divided: Milwaukee and Madison - the two largest cities - have explicitly declined to participate in civil immigration enforcement. Dane County Sheriff has stopped honoring ICE detainers. Several other counties reversed initial decisions to partner with ICE after public opposition. At the same time, sheriffs in rural and mid-size Wisconsin counties have signed agreements and are actively honoring detainers.
The central legal question in Wisconsin - whether sheriffs have any authority under state law to hold people on civil ICE detainers at all - is before the Wisconsin Supreme Court. The ACLU of Wisconsin filed the case on behalf of Voces de la Frontera in September 2025 against five county sheriffs. The Supreme Court (which has a 4-3 liberal majority) accepted it as an original action in December 2025. Sheriffs attempted to move the case to federal court; a federal judge remanded it back to the state Supreme Court in May 2026. A decision could come in 2026 that determines whether the practice of holding people on civil detainers is legal under Wisconsin law - which would have statewide implications for every county jail.
Wisconsin's approximately 70,000 undocumented residents are concentrated in dairy farming in western Wisconsin, meatpacking and food processing communities, and Milwaukee's Latino neighborhoods. Farmers in western Wisconsin reported that 60 to 90 percent of dairy workers are immigrants without legal status, and as of late 2025 that region had not seen the kind of enforcement surges visible in Minnesota and Illinois. Milwaukee has been preparing for possible ICE surge operations.
Part 1: Your rights under federal law - everywhere, including Wisconsin
These rights come from the U.S. Constitution. They apply in Wisconsin regardless of immigration status, citizenship, or how you entered the country.
At your front door
The Fourth Amendment protects your home from government entry without your consent or a judicial warrant. A judicial warrant is signed by a federal judge, based on probable cause, and authorizes entry to a specific address. An administrative warrant - ICE Form I-200 or I-205 - is signed by an immigration officer, not a judge, and does not authorize entry to your home without your consent. Ask through the door which type of warrant is being presented. If it is administrative, you are not required to open the door.
During a traffic stop or street encounter
You have the right to remain silent. You do not have to answer questions about where you were born, your immigration history, or your status. You can say you are exercising your right to remain silent and want to speak to a lawyer. You can ask whether you are free to go. If the officer says yes, you may calmly leave.
Do not lie and do not provide false documents. Silence is a legal right. False statements are a separate crime.
About ICE civil detainers - the Wisconsin Supreme Court case
An ICE civil detainer is a request - not a court order - asking a local jail to hold someone for up to 48 hours past their scheduled release so ICE can pick them up. Multiple federal courts have held that civil detainers are not legally binding on local agencies. The Wisconsin Supreme Court case filed by Voces de la Frontera and the ACLU argues that Wisconsin sheriffs have no authority under Wisconsin state law to make an arrest or hold a person based solely on a civil ICE administrative warrant. If the court agrees, it would become illegal under state law for any Wisconsin county jail to honor civil detainers without a judicial warrant. That decision has not been issued as of mid-2026. Until it is, the practice continues in many Wisconsin counties. Do not assume that being in a non-participating county means you cannot be held - ICE can arrest independently, and county jails in participating counties will hold people on detainers.
Do not sign anything without a lawyer
Documents presented during an ICE arrest may include voluntary departure agreements or stipulated removal orders that waive your right to a hearing before an immigration judge. Do not sign anything without speaking to an attorney first.
Part 2: The Wisconsin 287(g) map - who is in, who is out
Cities and counties that have declined to cooperate
Milwaukee Police Department has explicitly declined to participate in civil immigration enforcement and does not cooperate with ICE on civil immigration matters. Milwaukee County's standard - established through years of Voces de la Frontera advocacy - is that the jail will not hold someone for ICE unless there is a judicial warrant, meaning the person is being sought in connection with a crime.
Madison Police Department has explicitly said it will not cooperate with federal immigration enforcement efforts. Dane County Sheriff Kalvin Barrett announced that his department would no longer participate in the State Criminal Alien Assistance Program (SCAAP), which required sharing immigration data with federal authorities. Dane County stopped honoring civil ICE detainers.
Palmyra reversed an initial decision to accept ICE financial incentives after public outrage. Ozaukee County rejected ICE's offer. Kenosha County's sheriff initially reversed a position against participation but then declined to participate after being named in the Voces lawsuit.
Counties named in the Supreme Court lawsuit
The five counties named as respondents in the Voces de la Frontera Supreme Court case are Walworth, Brown, Sauk, Marathon, and Kenosha. All five had been honoring ICE detainers. Their attorneys argued that Wisconsin sheriffs honor detainers fully within the bounds of state and federal law - that is the legal question before the court.
The 287(g) agreements
As of June 2025, 13 Wisconsin law enforcement agencies had signed 287(g) agreements. Most are county sheriff offices in rural and smaller communities. The ACLU of Wisconsin's immigration report published in July 2025 documents the agencies involved and the financial incentives paid by ICE for participation. Check the ACLU of Wisconsin's tracking at aclu-wi.org for current agency status.
Part 3: The Wisconsin Supreme Court case - Voces de la Frontera v. sheriffs
The ACLU of Wisconsin filed a petition in September 2025 before the Wisconsin Supreme Court on behalf of Voces de la Frontera against five Wisconsin sheriffs. The lawsuit argues that honoring an ICE detainer constitutes an arrest under Wisconsin law, and that Wisconsin law enforcement does not have authority to make arrests based solely on civil ICE administrative warrants - which are not signed by a judge and do not constitute judicial warrants.
The Wisconsin Supreme Court, which has a 4-3 liberal majority, accepted the case in December 2025 as an original action, bypassing lower courts. The five sheriffs then attempted to remove the case to federal court. A federal judge in the Western District of Wisconsin ordered the case remanded back to the state Supreme Court on May 15, 2026, agreeing with Voces' attorneys that the sheriffs' removal attempt was procedurally improper. As of mid-2026, the case is pending before the Wisconsin Supreme Court. A final ruling could come in 2026 and would set binding statewide law on whether civil detainers are legal under Wisconsin state law.
This case matters directly for families. If the court rules for Voces, Wisconsin county jails would be prohibited from holding anyone on a civil ICE detainer without a judicial warrant - statewide. If the sheriffs prevail, the current practice continues. Either way, the decision will be the law of Wisconsin jails. Verify the case's current status with the ACLU of Wisconsin.
Part 4: Wisconsin's dairy farming communities
Wisconsin's dairy industry relies heavily on immigrant labor. Farmers in western Wisconsin have reported that 60 to 90 percent of dairy workers at many operations are immigrants without legal status. As of late 2025, western Wisconsin dairy communities had not experienced the kind of large-scale enforcement surges visible in Minnesota's meatpacking regions or Illinois's Chicago corridor. However, dairy communities across Wisconsin remain vulnerable.
The structure of dairy farming - workers living on or near the farm, isolated from urban support networks, dependent on the same employer for housing and work - creates specific vulnerabilities if enforcement reaches rural western Wisconsin. Knowing legal rights, having an emergency contact plan, and connecting with organizations like Voces de la Frontera - which has longstanding relationships with dairy worker communities - is especially important in these settings.
Part 5: What to do right now, before anything happens
Know your A-number and make sure trusted family members have it written down. ICE detainees from Wisconsin are transported to the Chicago ICE field office. Transfers to Chicago-area detention facilities are the expected path.
Know your county's 287(g) status and detainer practices. In Milwaukee County, the standard is judicial warrant required - local police will not hold you on a civil ICE detainer. In Walworth, Brown, Sauk, Marathon, and Kenosha counties (the named Supreme Court defendants), civil detainers have been honored. In other counties, verify with current sources. The ACLU of Wisconsin tracks this at aclu-wi.org.
Know the Supreme Court case is pending. If the Wisconsin Supreme Court rules for Voces, the legal landscape for civil detainers in Wisconsin changes statewide. Check the ACLU of Wisconsin or Voces de la Frontera for updates on when a decision is expected and what it means.
If you live in a dairy farming community in western Wisconsin, connect with Voces de la Frontera now. They have deep relationships with those communities and are the fastest emergency response network.
Prepare guardianship documents for any children. Set up a financial power of attorney so a trusted person can manage accounts and property if you are detained.
Part 6: Legal help and resources in Wisconsin
Voces de la Frontera is Milwaukee-based and Wisconsin's primary immigrant rights organization. Executive Director Christine Neumann-Ortiz has led the Supreme Court litigation and the community organization against 287(g) agreements statewide. They are the first call in a detention emergency, especially for Milwaukee-area and western Wisconsin dairy communities. Their website is vdlf.org.
ACLU of Wisconsin filed the Supreme Court case and publishes tracking reports on 287(g) agreements and the jail-to-deportation pipeline. Senior staff attorney Tim Muth leads the ICE detainer litigation. Their website is aclu-wi.org.
Immigration attorneys in Wisconsin who are actively tracking enforcement developments include those with the Wisconsin Association of Immigration Attorneys. Wisconsin Examiner and Wisconsin Watch have done the most detailed journalism on Wisconsin's enforcement landscape.
For immigration court case information, call the EOIR automated line at 1-800-898-7180. To locate someone in ICE custody, use the ICE Online Detainee Locator at locator.ice.gov. Wisconsin detainees are typically transferred to the Chicago ICE field office and held at facilities in the Chicago area. Call the ICE Detention Reporting and Information Line at 1-888-351-4024 if your person does not appear in the locator.
Immigration Advocates Network lists Wisconsin legal providers at immigrationadvocates.org.
Wisconsin's enforcement landscape is split: Milwaukee and Madison have explicitly declined civil immigration enforcement, Dane County stopped honoring detainers, and multiple communities pushed back on ICE's financial offers. At the same time, 13 agencies have 287(g) agreements, and civil detainers continue to be honored in many county jails. The Wisconsin Supreme Court is deciding whether honoring civil ICE detainers is legal under state law at all - a ruling that could change practices statewide. Your federal constitutional rights apply in full: an administrative warrant does not authorize entry to your home, your right to remain silent is unchanged, and you cannot be compelled to sign anything without a lawyer. Knowing your county's specific practices, connecting with Voces de la Frontera, and monitoring the Supreme Court case are the foundations for protecting your family in Wisconsin.
This page reflects conditions as of mid-2026. Thirteen 287(g) agreements were active as of June 2025; the number may have changed. The Wisconsin Supreme Court accepted the Voces/ACLU detainer case in December 2025. Sheriffs' attempt to remove to federal court was rejected May 15, 2026 and the case returned to the state Supreme Court - decision pending. Verify current 287(g) agency status and Supreme Court case status with ACLU of Wisconsin at aclu-wi.org or Voces de la Frontera at vdlf.org.