This article reflects Missouri law and enforcement conditions as of June 2026. Missouri has a pre-existing statutory ban on sanctuary policies, codified at RSMo Section 67.307, which prohibits municipalities from adopting policies limiting cooperation with federal immigration authorities and strips noncomplying jurisdictions of state grants. The Missouri State Highway Patrol (MSHP) signed a 287(g) Task Force Model agreement with ICE on March 21, 2025, making it one of the first state-level law enforcement agencies to do so nationally under the Trump administration. As of March 2026, more than 60 Missouri law enforcement agencies had signed 287(g) agreements. House Bill 2366, authorizing the Missouri Attorney General to investigate and prosecute employers who knowingly hire unauthorized workers, passed the 2026 legislature and was awaiting the governor's signature as of May 2026; if signed, it takes effect August 28, 2026. Verify its current signed status before relying on it. Enforcement postures vary significantly between Missouri's rural counties and its two major cities. Kansas City and St. Louis have more welcoming local approaches, but state law limits how far those postures can go. Verify current local agency policies with the ACLU of Missouri at aclu-mo.org or the Missouri Immigrant and Refugee Advocates (MIRA Coalition) at moimmigrant.org.
Where Missouri Stands
Missouri sits in the enforcement-leaning tier of this series, but with important internal variation. Unlike states with comprehensive mandatory enforcement mandates enacted in single bills, Missouri's enforcement architecture has been built layer by layer over more than a decade: a pre-existing employer verification law (2008), a sanctuary ban (codified over multiple sessions), a State Highway Patrol 287(g) agreement (March 2025), an expanding county agreement landscape (60-plus agencies by spring 2026), and a 2026 employer enforcement bill. No single dramatic legislative moment defines Missouri; instead, a steady accumulation of enforcement infrastructure.
What makes Missouri editorially distinctive in this series is the combination of the MSHP statewide Task Force agreement and the rapid expansion of county 287(g) agreements alongside Kansas City and St. Louis, which have tried to maintain more welcoming local postures while constrained by state law. Missouri is also the state that, along with Kansas, had 76 combined Task Force agreements as of early 2026, making the metro Kansas City area in particular one of the most densely 287(g)-covered regions in the country.
Missouri's geography also matters. It borders eight states, has major interstate corridors (I-70 and I-44 most prominently), and the Kansas City and St. Louis metro areas span state lines, with enforcement postures on the Missouri and Kansas sides of Kansas City differing significantly. The agricultural and meatpacking communities in southwest Missouri also face the specific industry-level enforcement risk that characterizes that sector nationally.
Part 1: What Federal Immigration Law Actually Says
Immigration enforcement is exclusively a federal function under the Immigration and Nationality Act (INA). The federal government controls who may enter, remain in, and be removed from the United States. State and local governments cannot create independent immigration enforcement systems that conflict with the INA.
The Tenth Amendment anti-commandeering doctrine, established in Printz v. United States (1997), means the federal government cannot compel state and local agencies to enforce federal immigration law. Missouri agencies that have signed 287(g) agreements did so voluntarily. The state has not enacted a mandatory 287(g) participation law, though such bills have been introduced. The sanctuary ban at RSMo 67.307 restricts municipalities from limiting cooperation but does not affirmatively compel it in the same way some other states have done.
Section 287(g) of the INA is the voluntary delegation mechanism through which ICE trains and authorizes local agencies to perform certain immigration enforcement functions. Missouri has three types of agreements in use: the Task Force Model (officers make immigration arrests during routine duties), the Jail Enforcement Model (jail staff screen inmates for immigration status), and the Warrant Service Officer Model (officers execute ICE administrative warrants). The MSHP's statewide Task Force agreement is the most significant because it covers enforcement across all of Missouri's roads and public spaces, not just a single county.
ICE detainers, Form I-247, are administrative requests, not court orders. Multiple federal circuits have held that honoring civil detainers without judicial authorization may expose holding agencies to Fourth Amendment liability. The Eighth Circuit, which covers Missouri, has not issued a definitive ruling on the question, but the trend of circuit court decisions nationally disfavors detainer holds without judicial authorization. Missouri agencies that honor detainers do so at their own legal risk.
Arizona v. United States (2012) is the controlling preemption precedent. Missouri's framework, structured as authorization and facilitation of voluntary federal enforcement rather than an independent state enforcement scheme, is designed to operate within the Arizona framework. Whether specific provisions of Missouri's enforcement architecture push against preemption limits is a question that has not been definitively litigated as of June 2026.
Part 2: Missouri State Law and Enforcement Infrastructure
RSMo Section 67.307 - Pre-Existing Sanctuary Ban
Missouri's prohibition on sanctuary policies predates the current enforcement environment. RSMo Section 67.307 prohibits municipalities from enacting or adopting sanctuary policies, defined as any policy that limits or prohibits municipal officials or employees from communicating or cooperating with federal agencies to verify or report the immigration status of any alien within the municipality, or that grants undocumented immigrants the right to lawful presence in violation of federal law. Any municipality that enacts a sanctuary policy is ineligible for state grant money until the policy is repealed.
This statute constrains what Kansas City, St. Louis, and other municipalities can do in terms of formal sanctuary policies. It does not, however, compel affirmative cooperation: the statute bars limiting cooperation, not bars refusing to volunteer cooperation. Missouri localities cannot formally restrict information sharing with ICE, but they retain some discretion in how actively they engage with ICE requests beyond the information-sharing floor.
RSMo Section 67.315 and Related Statutes - Status Inquiry
Missouri law also includes a requirement that local law enforcement agencies inquire about immigration status of individuals they arrest or detain. This statute has been on the books and reinforced across multiple legislative sessions, including Senate Bill 34 signed in 2019, which further codified that local law enforcement cannot adopt policies preventing officers from asking about immigration status during routine stops.
Missouri State Highway Patrol - 287(g) Task Force Model, March 21, 2025
The Missouri State Highway Patrol signed a Task Force Model 287(g) agreement with ICE on March 21, 2025. The MSHP was among the first state-level law enforcement agencies in the country to sign under the Trump administration's expanded 287(g) program. The statewide reach of MSHP is what makes this agreement distinctive: unlike a county sheriff's agreement that covers one county, MSHP officers operate across all of Missouri's roads, highways, and public spaces.
Under the Task Force agreement, trained MSHP officers have limited authority to make immigration arrests during the course of their normal enforcement duties. From September 26, 2025, through January 2026, MSHP officers obtained ICE detainers on approximately 36 people, according to MSHP data. Patrol officials stated that these detainers resulted from officers' normal enforcement duties rather than targeted immigration operations. The practical effect is that any MSHP encounter, including routine traffic stops on Missouri highways, carries immigration enforcement potential for undocumented individuals.
60-Plus Agency 287(g) Agreements Statewide
As of March 2026, more than 60 Missouri law enforcement agencies had signed 287(g) agreements with ICE. As of January 16, 2026, the count was 39 agencies: 28 Task Force Model, seven Warrant Service Officer, and four Jail Enforcement Model agreements. Three additional agencies had agreements pending at that time. By March 2026, St. Charles County Police Department joined, bringing the total to over 60.
Mid-Missouri agreements signed since 2025 include: the Missouri State Highway Patrol (Task Force, March 21, 2025), Pulaski County Sheriff (Task Force, July 29, 2025), Phelps County Sheriff (Task Force, October 17, 2025), Pettis County Sheriff (Jail Enforcement, August 28, 2025), and Callaway County Sheriff (Jail Enforcement, December 2, 2025). The geographic spread of agreements covers both rural counties and suburban areas, creating enforcement risk across the state.
Missouri's 287(g) expansion, combined with neighboring Kansas's expansion, has produced one of the most densely covered 287(g) regions in the country in the greater Kansas City area. A Kansas City Star report in early 2026 noted 76 combined agencies across Kansas and Missouri had Task Force agreements, many of them in or near the metro Kansas City area. This matters for families in Kansas City: even if the city itself has a more welcoming posture, surrounding counties and the state highway patrol have active Task Force authority.
House Bill 2366 - Employer Enforcement (Pending Governor Signature, Effective August 28, 2026)
House Bill 2366, passed by the Missouri Legislature in May 2026, strengthens the state's employer enforcement framework by giving the Missouri Attorney General authority to investigate and sue businesses that knowingly hire unauthorized workers. Under current Missouri law dating to 2008, the employer verification and enforcement system relies primarily on local governments, and the Attorney General's ability to directly investigate and penalize violating businesses is limited. HB 2366 changes that.
Key provisions of the 2026 bill include AG investigative and prosecutorial authority over businesses knowingly employing unauthorized workers, with use of a federal work authorization program such as E-Verify as an affirmative defense. The bill takes effect August 28, 2026, if signed by the governor. As of May 2026, it had passed both chambers and was awaiting signature. Verify its current signed status at aclu-mo.org or moimmigrant.org before relying on any provision.
Missouri has required public employers and businesses receiving state contracts or grants over $5,000 to participate in E-Verify since 2009, under the existing RSMo Section 285.525-285.555 framework. HB 2366 builds on that foundation by adding direct AG enforcement authority.
Kansas City and St. Louis - Local Postures
Kansas City and St. Louis have attempted to maintain more welcoming approaches to immigrant communities than much of rural Missouri, but the state sanctuary ban limits how far those postures can formally go.
Kansas City has adopted what its officials describe as a community safety approach, not issuing blanket sanctuary policies (which would violate state law) but focusing local police resources on crime rather than immigration enforcement. Kansas City police have stated that their officers do not conduct immigration enforcement. However, Jackson County, which contains much of Kansas City, has enforcement dynamics separate from the city police: county sheriffs operate independently, and surrounding suburban counties have 287(g) agreements.
St. Louis City and St. Louis County have similarly maintained postures focused on community trust. St. Louis City, as an independent city not part of a county under Missouri's unique structure, has distinct local governance. The St. Louis Metropolitan Police Department has not adopted a formal 287(g) agreement. However, St. Charles County, a suburban county in the St. Louis metro area, voted to formalize its 287(g) agreement in March 2026, joining more than 60 other Missouri entities. The St. Charles County Police Department had maintained an informal cooperation relationship with DHS for over 20 years before formalizing the agreement.
The practical effect of these local variations is that a person arrested in Kansas City or St. Louis faces a different immediate enforcement picture than a person arrested in Phelps County, Pulaski County, or St. Charles County. The MSHP agreement cuts across all of these: a traffic stop anywhere in Missouri by a state trooper carries potential immigration enforcement authority regardless of the local city or county posture.
Part 3: How State and Federal Law Interact in Missouri
Missouri's enforcement framework is built on voluntary participation facilitated by state authorization rather than a comprehensive mandatory enforcement mandate. The sanctuary ban (RSMo 67.307) removes the bottom floor: municipalities cannot formally limit cooperation. But the ceiling remains open: agencies have chosen different levels of engagement with ICE, from active Task Force participation to passive information sharing to measured non-volunteering.
The MSHP statewide Task Force agreement is constitutionally straightforward: it is voluntary cooperation authorized by Section 287(g), consistent with federal law and the Tenth Amendment framework. The sanctuary ban at RSMo 67.307 raises the more nuanced question of whether states can use grant conditions to compel information sharing, but that question has not been definitively litigated in Missouri.
The detainer question remains legally live. Missouri jails and detention facilities that honor ICE civil detainers without judicial authorization may face Fourth Amendment exposure under the evolving circuit court consensus. The Eighth Circuit has not issued a definitive ruling, but the trend of federal circuit decisions disfavors detainer holds without a judicial warrant. Missouri agencies should understand this liability landscape.
The employer enforcement framework, if HB 2366 is signed, adds a new state-level enforcement pathway that is structurally different from direct immigration enforcement: it targets employers who hire unauthorized workers, using state labor and business regulation law rather than immigration law per se. This approach is generally permissible under Arizona v. United States (2012) because the Court in that case specifically noted that states may use business licensing and similar tools to regulate the employment of unauthorized workers.
Arizona v. United States (2012) remains the outer framework. Missouri's approach, structured as facilitation and authorization rather than an independent state enforcement scheme, is designed within those constitutional limits.
Part 4: What This Means for Families on the Ground
For immigrant families in Missouri, the most important enforcement variable is which county and city they live in combined with whether they drive on state highways. The MSHP statewide Task Force agreement means that any traffic stop by a Missouri state trooper carries potential immigration enforcement authority, regardless of the local county's posture. A traffic stop on I-70 or I-44 is a different encounter than a stop by a Kansas City police officer.
In counties with Jail Enforcement Model agreements, such as Pettis and Callaway counties, any arrest that leads to a county jail booking triggers immigration screening. In counties with Task Force agreements, such as Pulaski and Phelps counties, trained deputies can make immigration arrests during routine field operations, not only at the jail. Families in those counties face street-level enforcement risk as well as jail-pipeline risk.
In Kansas City and St. Louis, local police generally do not conduct immigration enforcement, but the surrounding suburban counties do. A person in Kansas City who is arrested on any charge and taken to the Jackson County jail may face different enforcement dynamics than someone kept in Kansas City city custody. And state troopers have Task Force authority anywhere in either metro.
The 76 combined Missouri-Kansas Task Force agreements around the Kansas City metro area represent one of the most concentrated 287(g) regions in the country. For families in the KC metro, whether in Missouri or Kansas, the density of Task Force coverage means that routine police encounters carry elevated immigration enforcement risk compared to most comparable metro areas.
The employer enforcement framework expanding under HB 2366 creates risk at the employment level. Workers in Missouri whose employers receive state contracts or grants, or who are employed by businesses that might face AG investigation, should understand that employment verification and I-9 compliance create data points that can have immigration consequences. Consult an immigration attorney if you have questions about your employment documentation situation.
Families along Missouri's agricultural and meatpacking corridors in southwest Missouri, including the Springfield and Joplin areas, face the same industry-specific enforcement risk that applies nationally to food processing and agricultural communities. Those sectors have historically been targeted in federal workplace enforcement operations.
Part 5: What You Can Actually Do
If ICE or MSHP Comes to Your Home
Do not open the door. Neither ICE nor MSHP can legally enter a home without a judicial warrant signed by a judge. An ICE administrative warrant, Form I-200 or I-205, is signed by an immigration officer, not a judge, and does not authorize entry into your home. Ask through the closed door whether the warrant is signed by a judge. If it is not, you may say clearly that you do not consent to entry.
You have the right to remain silent. You are not required to answer questions about your birthplace, how you entered the country, or your immigration status. This right applies regardless of immigration status. Say: 'I am exercising my right to remain silent. I want to speak with a lawyer.'
Do not sign anything without speaking with an immigration attorney. Signing voluntary departure forms or other removal documents can permanently waive important legal rights.
If stopped by MSHP on a Missouri highway, you have the same right to remain silent about immigration status. MSHP troopers with Task Force authority can make immigration arrests during traffic stops. Stay calm, exercise your rights, and do not physically resist.
If a Family Member Is Detained
Use the ICE Online Detainee Locator at locator.ice.gov immediately. You will need the person's country of birth and either their full name and date of birth or their A-Number (Alien Registration Number). Missouri detainees may be held locally or transferred. Locating your family member quickly is critical.
Call the ICE Detention Reporting and Information Line: 1-888-351-4024.
Call the EOIR Immigration Court Information Line: 1-800-898-7180 for hearing dates and case status.
Contact Missouri Immigrant and Refugee Advocates (MIRA Coalition): moimmigrant.org. MIRA is Missouri's primary immigrant advocacy coalition.
Contact Legal Aid of Western Missouri (Kansas City area): lawmo.org.
Contact Legal Services of Eastern Missouri (St. Louis area): lsem.org.
Contact the ACLU of Missouri: aclu-mo.org.
Know the Risk Points in Missouri
Any MSHP traffic stop carries potential immigration enforcement risk statewide. The MSHP Task Force agreement is the broadest enforcement authority in Missouri and applies everywhere in the state.
Counties with Task Force agreements, including Pulaski and Phelps counties, have street-level enforcement authority beyond the jail. Counties with Jail Enforcement agreements, including Pettis and Callaway, screen inmates.
The Kansas City metro area has one of the highest concentrations of 287(g) agencies in the country when Missouri and Kansas counties are combined. Suburban counties surrounding both Kansas City and St. Louis have active agreements.
Workplace enforcement risk exists in agricultural and food processing sectors in southwest Missouri, particularly around Springfield and Joplin.
Employer enforcement under HB 2366 (if signed) means businesses receiving state contracts face AG scrutiny on workforce documentation. This is a secondary risk pathway for workers in those industries.
Part 6: Legal Resources in Missouri
Missouri Immigrant and Refugee Advocates (MIRA Coalition): moimmigrant.org. MIRA is the statewide coalition supporting immigrant rights advocacy and can connect families with legal resources.
Legal Aid of Western Missouri: lawmo.org. Legal Aid serves the western Missouri region including Kansas City, providing free civil legal services including immigration matters.
Legal Services of Eastern Missouri: lsem.org. Legal Services serves the eastern Missouri region including St. Louis, providing free legal services including immigration representation.
Migrant and Immigrant Community Action Project (MICA): micaproject.org. MICA works specifically with immigrant communities in the Kansas City and southwest Missouri areas.
ACLU of Missouri: aclu-mo.org. The ACLU of Missouri monitors enforcement developments and has spoken out against the expansion of 287(g) agreements in the state.
Immigration Advocates Network: immigrationadvocates.org.
National Immigrant Justice Center (Chicago): immigrantjustice.org.
EOIR Immigration Court Information Line: 1-800-898-7180.
ICE Detainee Locator: locator.ice.gov.
ICE Detention Reporting and Information Line: 1-888-351-4024.
Summary
Missouri has built a layered enforcement framework over multiple legislative sessions. The pre-existing sanctuary ban at RSMo Section 67.307 prohibits municipalities from limiting federal immigration cooperation and strips noncomplying jurisdictions of state grants. RSMo Section 67.315 requires local law enforcement to inquire about immigration status of arrested individuals. The Missouri State Highway Patrol signed a statewide Task Force Model 287(g) agreement on March 21, 2025, giving trained troopers immigration arrest authority on any Missouri road. By March 2026, more than 60 Missouri law enforcement agencies had signed 287(g) agreements. House Bill 2366, giving the Missouri AG authority to investigate and sue businesses knowingly employing unauthorized workers, passed the 2026 legislature with an effective date of August 28, 2026, pending the governor's signature as of May 2026.
For families in Missouri, the MSHP statewide agreement means any highway traffic stop carries potential immigration enforcement risk. County-level risk depends on local 287(g) participation. Kansas City and St. Louis maintain more welcoming local police postures but are constrained by state law and surrounded by suburban counties with active agreements. The KC metro area is one of the most densely 287(g)-covered regions nationally when Missouri and Kansas counties are combined. Know your rights at the door, exercise the right to remain silent, use the ICE Detainee Locator immediately if a family member is detained, and contact MIRA or local legal aid for current guidance.
Sources and verification: Missouri RSMo Section 67.307 (sanctuary policy prohibition); RSMo Sections 67.315 and 285.525-285.555 (status inquiry and employer verification); Missouri State Highway Patrol 287(g) Task Force Agreement, March 21, 2025; ABC17 News, 'More Missouri Law Enforcement Agencies Have Joined ICE Immigration Partnership,' January 17, 2026; STLPR, 'St. Charles County Passes Bill to Formally Collaborate with ICE,' March 31, 2026 (60-plus agencies statewide); STLPR, 'Immigration Researcher Sees ICE Trends Playing Out in Missouri,' March 11-12, 2026; KCUR, 'Missouri Police That Sign New ICE Agreements Face Political Backlash and Expensive Lawsuits,' March 18, 2026; Missourinet, 'Missouri Legislature Passes Bill About Businesses Hiring Illegal Immigrants,' May 17-18, 2026 (HB 2366, awaiting governor signature, effective August 28, 2026 if signed); Kansas City Star reporting on 76 combined Missouri-Kansas Task Force agreements, early 2026; MSHP 287(g) detainer data (36 detainers, September 26, 2025-January 2026); Arizona v. United States, 567 U.S. 387 (2012); Printz v. United States, 521 U.S. 898 (1997). Volatile items requiring verification: HB 2366 governor signature status (passed May 2026, awaiting signature as of May 2026; verify at aclu-mo.org or moimmigrant.org); current count of Missouri 287(g) agencies (growing, verify at ice.gov); any state-level mandatory cooperation legislation enacted in 2026 session. Last verified: June 2026.