A federal judge has changed what immigration agents must establish before making certain warrantless arrests in Los Angeles and six surrounding Southern California counties.
The ruling does not end immigration enforcement or require a warrant for every immigration arrest. Instead, it applies the existing federal requirement that, before making a warrantless civil immigration arrest, an immigration officer must have probable cause to believe the person is likely to escape before a warrant can be obtained. The new order requires agents to consider the circumstances known to them and document their escape-risk analysis.
The underlying federal statute, 8 U.S.C. § 1357(a)(2), provides the legal authority for certain warrantless immigration arrests and includes the requirement concerning the likelihood of escape before a warrant can be obtained.
For people in Los Angeles, the practical question is simple:
What is supposed to happen before an immigration agent can arrest someone without a warrant?
What changed?
U.S. District Judge Maame Ewusi-Mensah Frimpong issued a preliminary injunction on Sept. 2 in Vasquez Perdomo v. Mullin. The order was unsealed Sept. 16.
The case concerns federal immigration arrests made without warrants in the Central District of California.
Under the order, agents must consider the totality of the circumstances known to them before making a warrantless civil immigration arrest, including the person’s likelihood of escape. The order also requires agents to document their escape-risk analysis.
The court’s order also addresses the government’s use of an internal January 2026 memorandum concerning escape risk. The injunction directs federal officials to stop relying on that memorandum’s escape-risk standard or analytical approach for the warrantless arrests covered by the order.
The order applies throughout the Central District of California, including Los Angeles, Orange, Riverside, San Bernardino, Ventura, Santa Barbara and San Luis Obispo counties.
Why does the “escape” requirement matter?
Federal law does not simply say that an immigration officer may make a warrantless civil arrest whenever the officer believes someone is unlawfully present.
Section 1357(a)(2) includes a second requirement: the officer must have reason to believe the person is likely to escape before a warrant can be obtained. Read the federal statute
The new court order focuses on how that requirement is applied.
In its preliminary findings, the court concluded that the evidence presented in the case showed federal immigration agents were regularly failing to conduct an individualized likelihood-of-escape analysis before making warrantless arrests. The court considered government directives, arrest narratives, agent testimony and video evidence.
The court record included evidence concerning individual arrests as well as government-produced arrest records. According to the plaintiffs’ account of the evidence, 113 arrest records were examined during discovery, and nearly 80% either contained no escape-risk assessment or relied substantially on standardized language. The plaintiffs also pointed to sworn testimony concerning how agents conducted warrantless arrests. These are allegations and evidence presented in the litigation; the court’s preliminary injunction reflects the judge’s findings at this stage of the case.
The important point for readers is that unlawful immigration status by itself is not the entire statutory test for a warrantless civil immigration arrest.
What the ruling does and does not mean
The distinction matters.
The ruling does mean:
- Federal immigration agents in the covered district must make an individualized escape-risk determination before making a warrantless civil immigration arrest.
- Agents must consider the circumstances known to them rather than treating immigration status alone as sufficient to establish the likelihood of escape.
- Agents must document their escape-risk analysis when making covered warrantless arrests. Read the court’s preliminary injunction
The ruling does not mean:
- ICE has stopped making arrests.
- Every immigration arrest now requires a judicial warrant.
- Immigration proceedings or deportations have stopped.
- A person without lawful immigration status cannot be arrested.
- Federal immigration enforcement has ended in Los Angeles.
The order concerns a specific category of enforcement: civil immigration arrests made without a warrant.
That distinction is important because an immigration arrest can still occur under other circumstances and through other legal procedures.
Who is covered?
The geographic reach is larger than Los Angeles.
The injunction applies in the Central District of California, which includes:
- Los Angeles County
- Orange County
- Riverside County
- San Bernardino County
- Ventura County
- Santa Barbara County
- San Luis Obispo County
The case materials identify the Central District of California as the court where the lawsuit is being litigated and describe the federal enforcement operations at issue across Los Angeles and surrounding counties. See the case record
That means the ruling affects federal immigration enforcement across a large portion of Southern California.
Why Los Angeles residents are paying attention
The underlying lawsuit was filed after federal immigration enforcement operations in the Los Angeles area beginning in 2025.
The plaintiffs include individual workers and community organizations that challenged federal immigration stops and arrests. The case is being litigated in federal court in the Central District of California. Read the case background from ACLU SoCal
The case has produced multiple rounds of litigation involving federal immigration enforcement in Southern California.
The U.S. Supreme Court previously intervened in the broader dispute over immigration stops. In September 2025, the Court granted the federal government’s application to stay an earlier district-court order.
That earlier proceeding and the new preliminary injunction address different questions.
The earlier litigation involved the circumstances under which federal agents could stop people.
The new order addresses when federal agents can make a warrantless civil immigration arrest.
A rule governing an immigration stop is not necessarily the same as a rule governing an immigration arrest.
Parriva previously explained the broader litigation in A California Judge Just Ruled on Warrantless ICE Arrests. What Does it Mean for Deportations? Parriva’s earlier explainer
What to expect next?
The ruling is a preliminary injunction, meaning the litigation is continuing.
The court’s order is an interim ruling in the case; it does not resolve every issue raised by the lawsuit or constitute a final judgment on the underlying claims.
The government’s response to the injunction, including any appeal or request for further review, will therefore remain an important part of the case’s next phase.
That makes implementation and compliance the next major issue to watch.
For Southern California residents, the practical significance is therefore not that immigration enforcement has disappeared.
It is that the federal government now faces a more specific legal requirement before making certain warrantless civil immigration arrests in the region.
Parriva will continue to follow how the order is implemented, whether the government seeks further appellate review, and what the courts decide as the underlying case moves forward.
What readers should remember
A warrantless immigration arrest is still possible. But in the Central District of California, federal agents must now make and document an individualized determination that the person is likely to escape before a warrant can be obtained.
Unlawful immigration status alone is not enough to make that determination.
And the case is not over.
Parriva will continue to follow how the order is implemented, whether the government appeals, and what the courts decide as the underlying case moves forward.
