Public Safety & Justice Reviewed July 2026
How immigration enforcement works in NYC
New York City honors an ICE detainer only with a judge's warrant and a serious criminal conviction from the past five years. Here is the legal machinery, city, state, and federal, that sets what agents can and can't do here.
The numbers that matter
- The detainer rule
- City agencies honor an ICE detainer only with a judicial warrant and a conviction for a violent or serious crime (or a terror-watchlist match) (NYC Admin Code § 9-131, read July 2026)
- Judicial vs. ICE warrant
- A 'judicial warrant' means one signed by a judge; an ICE detainer or administrative warrant does not qualify (NYC Admin Code § 9-131, read July 2026)
- The courthouse
- Since the 2020 Protect Our Courts Act, no civil arrest inside a New York state court without a judicial warrant or order (Protect Our Courts Act (S.425-A), 2020)
- What ICE still may do
- Federal law lets immigration officers arrest without a judge's warrant in defined circumstances (8 U.S.C. § 1357, read July 2026)
The whole fight is about one word: warrant
Almost every New York rule on immigration enforcement turns on a single distinction: a judicial warrant versus everything else ICE issues. A judicial warrant is signed by a judge. An ICE detainer or an administrative warrant is signed by ICE itself. The city's law defines the difference precisely:
'Judicial warrant' shall mean a warrant based on probable cause and issued by a judge appointed pursuant to article III of the United States constitution or a federal magistrate judge appointed pursuant to 28 U.S.C. § 631, that authorizes federal immigration authorities to take into custody the person who is the subject of such warrant.
Hold onto this. When you hear that the city 'won't cooperate with ICE,' the fine print is almost always this: it won't act on ICE's own paperwork, only on a judge's. An ICE detainer is a request; a judicial warrant is a court order.
What the city will not do: hold you for ICE
A detainer is ICE asking the city to keep someone locked up past their release date so agents can come collect them. New York's answer, written into the Administrative Code, is a hard two-part test, a judge's warrant and a serious conviction, both at once:
The department may only honor a civil immigration detainer by holding a person beyond the time when such person would otherwise be released from the department's custody ... or by notifying federal immigration authorities of such person's release, if: ... federal immigration authorities present the department with a judicial warrant for the detention of the person who is the subject of such civil immigration detainer ... has been convicted of a violent or serious crime, or B. is identified as a possible match in the terrorist screening database.
The exception is real and worth stating plainly: for someone with a recent violent or serious conviction and a judge's warrant, the city can hold them. This is not 'ICE never gets anyone from the jails.' It is a narrow, specific door.
The city is also careful to say it is not defying federal law, only declining to do ICE's work for free:
Nothing in this local law shall be construed to prohibit any city agency from cooperating with federal immigration authorities when required under federal law.
What the city will not share
The other half of a sanctuary law is information. City workers are instructed not to spend city time or resources feeding routine data to immigration agents:
Department personnel shall not expend time while on duty or department resources of any kind disclosing information that belongs to the department and is available to them only in their official capacity, in response to federal immigration inquiries
Inside the jails it goes one step further. ICE cannot set up a field office on city correctional land to run civil immigration cases:
Federal immigration authorities shall not be permitted to maintain an office or quarters on land over which the department exercises jurisdiction, for the purpose of investigating possible violations of civil immigration law
This is why ICE was pushed off Rikers Island. Agents can still request a judicial warrant like anyone else; what they cannot do is keep a desk in the building and work the release logs.
The state's courthouse rule: the Protect Our Courts Act
Albany added its own layer in 2020. The Protect Our Courts Act made a courthouse one of the hardest places in the state for ICE to make a civil arrest, on the theory that people should not have to risk arrest to show up to court as a witness, a plaintiff, or a defendant:
A person duly and in good faith attending a court proceeding in which such person is a party or potential witness, or a family or household member is a party or potential witness, is privileged from civil arrest while going to, remaining at, and returning from, the place of such court proceeding, unless such civil arrest is supported by a judicial warrant or judicial order authorizing such civil arrest.
And it drew a bright line inside the courthouse door itself:
no civil arrest shall be executed inside a New York state courthouse except pursuant to a judicial warrant or judicial order authorizing the arrest
Same word again: judicial. The pattern is deliberate. City law, state law, jail policy, courthouse policy, all built around the one document ICE usually does not have, a warrant signed by a judge.
What federal agents can still do
Here is the part the 'sanctuary' label obscures. None of these laws can revoke ICE's federal authority. They bind what city and state employees do, not what federal agents may do. And federal law hands those agents genuine arrest power, including without a judge's warrant in defined situations:
to arrest any alien in the United States, if he has reason to believe that the alien so arrested is in the United States in violation of any such law or regulation and is likely to escape before a warrant can be obtained for his arrest
This is why the standoff is real. In a public place, a federal officer can act on federal authority. What the city and state have done is refuse to help: no holds, no data, no courthouse arrests, no desk at Rikers, absent a judge's signature. They cannot switch off federal law inside city limits.
So the honest map: the city and the state have made themselves an unhelpful host, declining to hold people, hand over records, or open the courthouse door without a judge's warrant. What they cannot do is turn off federal law between the rivers. That gap, between what City Hall controls and what Washington does, runs through half of New York politics; see who actually runs New York City.
The questions New Yorkers actually ask
Does New York City cooperate with ICE?
Only narrowly. City agencies won't honor an ICE detainer or share routine data unless ICE brings a judicial warrant (one signed by a judge) and, for a detainer, the person has a conviction for a violent or serious crime or matches a terror watchlist. The law also says nothing in it stops cooperation that federal law actually requires.
What is the difference between an ICE detainer and a judicial warrant?
An ICE detainer or administrative warrant is issued by ICE itself, asking a jail to hold someone; it is a request, not a court order. A judicial warrant is issued by a judge based on probable cause. New York City's law acts only on the judicial kind, which ICE usually does not have.
Can ICE arrest someone at a New York courthouse?
Not for a civil immigration matter without a judicial warrant or order. The 2020 Protect Our Courts Act makes people attending court privileged from civil arrest coming, going, and while there, and bars civil arrests inside a state courthouse unless a judge signed off.
Can ICE still make arrests in NYC?
Yes. These city and state laws limit what local and state employees do; they cannot strip federal agents of federal authority. Federal law lets immigration officers arrest without a judge's warrant in defined circumstances, so ICE can still operate here, just without the city's help.
The documents
The public records this page draws on. Read them yourself:
Now watch the machinery move.
These pages explain how the city works on paper. The morning brief is how it worked today: what changed, what it means for your rent, your commute, and your block, in plain language.
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