A Southern California federal judge has granted part of a challenge to ICE’s warrantless arrests. The ruling could affect how some immigrants are taken into custody, but it does not stop deportations or protect everyone without a criminal record.
A federal judge in Southern California has taken another significant step in a closely watched legal fight over how Immigration and Customs Enforcement can arrest people in California.
On Sept. 2, U.S. District Judge Maame Ewusi-Mensah Frimpong granted in part a motion challenging warrantless ICE arrests in Vasquez Perdomo v. Mullin, a case arising from immigration enforcement operations across Southern California. The judge also granted part of the plaintiffs’ request to certify a class.
But there is an important limitation: the Sept. 2 preliminary-injunction order is sealed. The public docket confirms that the motion was granted in part, but does not yet provide the operative language showing exactly what ICE is prohibited from doing.
The ruling does not mean deportations have stopped. It does not mean immigrants without criminal convictions can no longer be deported. And it does not establish that ICE can no longer make warrantless arrests throughout California.
Instead, the immediate question is narrower and potentially consequential:
What changes when a federal court limits how immigration agents can make arrests?
The case is about more than deportation
The lawsuit challenges the way federal immigration agents have conducted stops, questioning and arrests in Southern California.
The plaintiffs argue that agents have detained people without adequate individualized suspicion and have used factors such as race, ethnicity, occupation and location in deciding whom to stop. The government has disputed the allegations and defended its enforcement practices.
In an August ruling allowing the case to continue, Judge Frimpong said the plaintiffs had sufficiently alleged that immigration agents were conducting stops without reasonable suspicion. Federal regulations likewise provide that immigration officers may briefly detain someone for questioning when they have reasonable suspicion based on specific, articulable facts. Federal immigration enforcement standards
The September ruling moves that legal fight into another stage.
The public docket records the Sept. 2 order as “granting in part” the plaintiffs’ preliminary-injunction motion concerning warrantless arrests.
But until the operative order is publicly available, readers should be skeptical of claims about exactly what ICE must now do differently.
Does this mean deportations will slow down?
Possibly, but not automatically.
An arrest is one part of the immigration-enforcement pipeline:
arrest → detention → immigration proceedings → removal
If a court restricts a particular category of warrantless arrests, fewer people could enter that pipeline through that route.
But that does not mean the court has ordered an end to deportations.
ICE and the Department of Homeland Security have other enforcement mechanisms available under federal law. Federal law allows immigration officers to make certain arrests with administrative warrants, while 8 U.S.C. § 1357(a)(2) separately establishes circumstances in which an immigration officer may make a warrantless arrest.
A court ruling affecting one type of arrest therefore does not necessarily eliminate the government’s ability to pursue a removal case.
That is why the most accurate way to describe the potential impact is:
The ruling could change how some people are arrested and detained. It does not, by itself, end the federal government’s authority to seek their deportation.
What about immigrants who have never been convicted of a crime?
Having no criminal conviction does not automatically make someone immune from immigration enforcement.
Immigration violations and criminal convictions are different legal categories. ICE can pursue people based on alleged violations of immigration law even when those people do not have criminal convictions.
Parriva previously examined this distinction in our reporting on ICE arrests in Southern California, where available regional data showed that ICE’s broader enforcement activity has included people with criminal convictions, people with pending charges and people with no criminal charges or convictions.
That does not mean every ICE operation targets all of those groups equally.
It means readers should not equate “ICE arrest” with “criminal arrest.”
The legal basis for immigration detention can be different from the legal basis for a criminal prosecution.
Why the word “warrant” matters
There is another distinction that can easily get lost.
An immigration administrative warrant is not the same thing as a judicial warrant issued in connection with a federal criminal case.
Parriva recently examined that distinction in our report on Operation Guardian Angel, which documented how federal prosecutors have used judicial warrants to obtain custody of people already being held in Southern California jails.
That program illustrates why a restriction on one form of immigration arrest does not necessarily shut down federal enforcement.
Federal immigration enforcement is a system with multiple pathways.
California’s sanctuary laws don’t stop ICE
California’s sanctuary protections also do not prevent federal immigration agents from enforcing federal immigration law in the state.
The California Values Act, commonly known as SB 54, limits how state and local agencies can participate in federal immigration enforcement. It does not eliminate ICE’s federal authority.
That is why a federal court ruling concerning ICE arrests and California’s sanctuary laws should not be treated as the same legal question.
One concerns what federal immigration agents can do.
The other concerns what California and local governments can be required or permitted to do to assist them.
For families trying to understand the current enforcement environment, that distinction is important.
California is becoming a legal battleground
The Southern California case is part of a broader series of legal challenges to federal immigration enforcement in California.
In the Central Valley, a separate federal case challenged immigration enforcement practices involving warrantless arrests. That litigation produced findings concerning the government’s obligations when making warrantless arrests, including consideration of statutory requirements involving flight risk and danger to the community. 8 U.S.C. § 1357 and federal warrantless-arrest requirements
Meanwhile, the Southern California lawsuit has continued to challenge what plaintiffs describe as unlawful stops and arrests.
Parriva previously examined the broader Los Angeles litigation in Inside the Los Angeles Immigration Lawsuit That Could Reshape Federal Enforcement Across Southern California.
The September ruling adds another important chapter.
What the ruling does, and does not, tell us
What we know:
- Judge Frimpong ruled Sept. 2 on the plaintiffs’ preliminary-injunction request.
- The motion concerning warrantless arrests was granted in part.
- The plaintiffs’ class-certification request was also granted in part.
- The operative order is currently sealed. Public docket for the Perdomo case
What we do not yet know from the public order:
- The precise restrictions placed on ICE.
- Exactly which arrests are covered.
- The precise geographic scope of the injunction.
- Whether and how ICE must change its arrest procedures.
- How many arrests or deportations could ultimately be affected.
Those questions matter because a preliminary injunction can change enforcement practices without eliminating the underlying federal immigration laws.
So, will deportations slow down?
It is too early to say.
The ruling could reduce some arrests if the injunction limits a significant enforcement pathway. That could, in turn, reduce the number of people entering detention and removal proceedings through that pathway.
But that is a potential downstream effect, not something the September 2 ruling has already established.
ICE could also shift enforcement toward other legally available mechanisms.
Parriva’s reporting has documented the scale of the broader enforcement campaign. Our analysis of the increase in ICE deportations, street arrests and arrests of people without criminal convictions found a major increase in enforcement during the current administration, illustrating why a restriction on one arrest mechanism should not automatically be interpreted as a halt to deportations.
What this means for immigrant families
For families in Southern California, the most important takeaway is simple:
A court ruling about warrantless arrests is not the same as a court ruling that ends deportations.
It may change the circumstances under which some people can be taken into custody. But immigration cases can still proceed through other legal pathways.
And having no criminal conviction does not automatically remove someone from the immigration-enforcement system.
The practical consequences of Judge Frimpong’s ruling will become clearer once the operative order is publicly available.
For now, the most significant change is legal rather than numerical:
A federal court has intervened in how ICE conducts arrests in Southern California. The next question is how broad that intervention actually is and whether it changes the number and type of people who enter the deportation pipeline.
