The Law

1. Authority to arrest, detain and remove

• Arrest and detention pending removal. The Immigration and Nationality Act lets officers arrest and detain a noncitizen, on a warrant issued by the Attorney General (now DHS), while removal proceedings are pending. 8 U.S.C. § 1226
• Detention after a removal order. Once a person is ordered removed, the government generally must remove them within 90 days and must detain them during that period. 8 U.S.C. § 1231
• Questioning and warrantless arrest. Officers may question anyone believed to be a noncitizen about their right to be in the U.S. They may arrest without a warrant if they have “reason to believe” the person is here unlawfully and “is likely to escape before a warrant can be obtained.” 8 U.S.C. § 1357(a) · Regulations add enforcement standards, including that a brief stop for questioning requires reasonable suspicion. 8 C.F.R. § 287.8

2. Administrative vs. judicial warrants, and homes

• Two kinds of warrant. ICE arrest warrants (Form I-200) and removal warrants (Form I-205) are signed by immigration officials, not judges. A judicial warrant is signed by a judge. The arrest-warrant authority is in § 1226(a), and ICE’s enforcement standards are in 8 C.F.R. § 287.8.
• Homes and the Fourth Amendment. Without consent or an emergency, police generally need a warrant to enter a home to make an arrest. In Payton v. New York (1980), that meant a warrant issued by a neutral magistrate. Payton v. New York (Oyez) · ICE’s regulation bars officers from entering a residence to question people without “a warrant” or consent. 8 C.F.R. § 287.8(f)(2)
• Contested. ProPublica reported a 2026 ICE memo asserting that administrative warrants allow forced entry to arrest people with final removal orders. That position is being challenged in court, and DHS says it has “paused” the policy. ProPublica, Oct 2026

3. Federal supremacy, sanctuary policies and obstruction

• Immigration is federal. Arizona v. United States (2012) struck down most of Arizona’s SB 1070 as preempted by federal law, holding that the federal government has broad and undoubted power over immigration. Arizona v. United States (Oyez)
• States can’t be forced to help. Under the anti-commandeering doctrine, Congress cannot compel state or local officers to carry out a federal program. Printz v. United States (1997) applied this to local law enforcement. Printz v. United States (Oyez) This is the legal basis for “sanctuary” limits on cooperation.
• But they can’t block information sharing by statute. Federal law bars state and local governments from restricting their officials from sharing citizenship or immigration-status information with immigration authorities. 8 U.S.C. § 1373
• No obstruction. Anyone who forcibly assaults, resists, opposes, impedes, intimidates or interferes with a federal officer on duty commits a federal crime. 18 U.S.C. § 111

4. Roving stops: Noem v. Vasquez Perdomo (2025)

• On Sept. 8, 2025, the Supreme Court stayed a district court order that had barred immigration stops in the Los Angeles area based only on factors like apparent race or ethnicity, language, location or type of work. The stay lasts while the appeal continues; the Court did not issue a final ruling on the merits. Justice Kavanaugh concurred; Justice Sotomayor, joined by Justices Kagan and Jackson, dissented. Noem v. Vasquez Perdomo (LII) · Order (supremecourt.gov)

5. Due process limits

• Trump v. J.G.G. (Apr. 7, 2025). People facing removal under the Alien Enemies Act must challenge it through habeas in the district where they are held, and they are entitled to notice and a chance to seek habeas relief before removal. Opinion (supremecourt.gov)
• A.A.R.P. v. Trump (May 16, 2025). The Fifth Amendment entitles noncitizens to due process in removal proceedings. Notice of roughly 24 hours, with no information on how to contest removal, was not enough. The Court temporarily blocked removals of the class while the case continued. Opinion (supremecourt.gov)

6. Use of force

• Reasonableness standard. Force used in an arrest is judged under the Fourth Amendment by whether it was “objectively reasonable,” from the perspective of a reasonable officer on the scene, considering the severity of the crime, the immediate threat and any resistance or flight. Graham v. Connor (1989). Graham v. Connor (Oyez)
• Deadly force. Deadly force against a fleeing suspect is unconstitutional unless the officer has probable cause to believe the suspect poses a significant threat of death or serious physical injury. Tennessee v. Garner (1985). Tennessee v. Garner (Oyez)
• Vehicles. In Scott v. Harris (2007), Plumhoff v. Rickard (2014) and Mullenix v. Luna (2015), the Court ruled for officers who used force against drivers in dangerous vehicle flights. Those rulings are partly about qualified immunity in civil suits; they do not decide any particular shooting. Scott (Oyez) · Plumhoff (Oyez) · Mullenix (Justia)

7. Why do ICE agents wear masks?

• DHS’s reason. DHS says officers wear masks to protect themselves and their families from doxxing, threats and targeting by gangs such as Tren de Aragua and MS-13. It says they still identify themselves as law enforcement, wear marked vests and use marked vehicles. DHS, Sept 22, 2025
• DHS’s assault figures. DHS reported 238 assaults on ICE officers from Jan 21 to Nov 21, 2025, against 19 in the same period of 2024, which it calls a 1,153% increase. DHS, Nov 24, 2025 Earlier releases cited 500% (June 2025) and 1,000% (Sept 2025) increases and said officers’ families had been doxxed. DHS, June 20, 2025
• Questions about the data. CPR News said DHS did not provide the underlying data when asked, and found federal assault cases rose far less than claimed. CPR News, Oct 2, 2025 A Los Angeles Times review of court records found few serious injuries. LA Times, Dec 1, 2025
• Critics’ concerns. Critics say masks make it harder to hold officers accountable and easier for criminals to pose as ICE. There have been real impersonation cases:
  • A South Carolina man who posed as an ICE officer and detained Latino men on Sullivan’s Island was charged with kidnapping and impersonation, and later sentenced to probation for impersonating an officer. CNN · Live 5 News
  • A Florida woman wearing a face mask and an “ICE” shirt was charged with kidnapping while impersonating an officer. USA Today
• California’s No Secret Police Act (SB 627). Signed Sept 20, 2025, it bans most law enforcement officers, including federal agents, from wearing face coverings on duty.
  • The United States sued in November 2025.
  • On Feb 9, 2026, a federal judge blocked the mask ban as applied to federal officers. She found it likely discriminates against the federal government, because it exempts some state officers.
  • California did not appeal that part of the ruling.
  • The Ninth Circuit separately blocked California’s companion ID law (SB 805) for the duration of the appeal.
  AP · Ninth Circuit order, Apr 22, 2026 (Justia) · Case docket summary
• Federal bills.
  • Democrats introduced the VISIBLE Act, which would require visible ID and ban most masks during public enforcement. Axios, July 2025
  • Sen. Marsha Blackburn introduced the Protecting Law Enforcement from Doxxing Act (S. 1952). It would make it a crime to publish a federal officer’s name with intent to obstruct an investigation or immigration operation. Congress.gov
  • Neither had become law as of the last update to this page.

Last reviewed Oct 12, 2026. Spotted an error? Corrections policy.