Immigration Detainers and ICE Holds Explained

Short answer: An ICE detainer is a written request — not a court order — asking a jail or prison to notify Immigration and Customs Enforcement before releasing someone, and in many cases to hold that person for up to an additional 48 hours (not counting weekends and holidays) so ICE can take custody. The current form is DHS Form I-247A, "Immigration Detainer — Notice of Action" (also described on its face as a request for voluntary action). Courts have repeatedly held that detainers are requests, not commands, and a growing number of states and localities limit or refuse to honor them. Whether a particular jail complies depends on that jurisdiction's own policy and on whether ICE also has an independent basis — such as a judicial warrant — to hold the person.

What a detainer actually asks a jail to do

A detainer is issued under a federal regulation, 8 C.F.R. § 287.7, and is normally lodged after someone is arrested and booked into a local or state jail — often on an unrelated criminal charge, and sometimes after a fingerprint or database check flags the person as a possible noncitizen. The form generally asks the jail to do two things:

• Notify ICE before the person is released from custody, ideally with enough lead time for ICE to arrange to take custody, and
• Maintain custody of the person for up to 48 hours (excluding Saturdays, Sundays, and federal holidays) past the point when they would otherwise have been released — for example, after posting bail, having charges dropped, or completing a sentence — so ICE has a window to arrive and take the person into federal custody.

The form itself typically states that the detainer "arises from DHS authorities" and is not supposed to affect decisions in the underlying criminal case — bail, sentencing, parole, or work and housing assignments inside the facility are supposed to be handled independently of the detainer.

Why "request" matters: detainers are not warrants

This is the single most important legal distinction to understand. A detainer is issued by an immigration officer, not a judge, and it is not the same as a judicial arrest warrant signed by a court based on a finding of probable cause. Federal appeals courts — including the Third Circuit — have held that immigration detainers are, by their own terms, requests rather than commands, and that they do not create a mandatory legal obligation for state or local jails to comply. Several federal courts have gone further, ruling that holding someone in custody solely because of a detainer request, with no independent judicial determination that there is probable cause to detain them, can violate the Fourth Amendment's protection against unreasonable seizures.

ICE separately has its own administrative arrest and removal warrants — commonly Form I-200 (Warrant for Arrest of Alien) and Form I-205 (Warrant of Removal/Deportation) — but these are issued by immigration officers within DHS, not by a judge, and are legally distinct from a criminal arrest warrant reviewed by a court. A detainer, an administrative warrant, and a judicial warrant are three different things, and which ones (if any) accompany a specific detainer request can matter a great deal to what a jail is willing to do and what rights are in play.

Why compliance varies so much by state and county

Because a detainer is a request and not a court order, many states, counties, and cities have adopted policies — sometimes called "TRUST Act" or "sanctuary" policies — that limit when local law enforcement will honor one. Common limits include only honoring a detainer if it is paired with a judicial warrant, only honoring it for people convicted of certain serious offenses, or declining ICE holds altogether while still notifying ICE of a release date if legally required to. Other jurisdictions cooperate closely with ICE, including through formal 287(g) agreements that deputize some local officers to help with immigration enforcement.

This means the same detainer form can produce very different results depending entirely on where someone is arrested. It also means the existence of a detainer does not, by itself, tell you what will happen next — you have to know the specific jail's and state's current policy, which can and does change. See our companion guide on how local police work with ICE, sanctuary policies, and detainers for how this plays out from the law-enforcement side of an encounter.

What it means if a detainer is lodged against someone

If a detainer has been lodged, it generally means ICE believes, based on records checks or a tip, that the person may be removable, and it wants advance notice — and often extra custody time — before that person is released from jail. It does not mean a final decision on immigration status or removal has been made, and it does not by itself start the formal removal (deportation) process; that happens later, if ICE takes the person into custody and issues a Notice to Appear in immigration court. See our guide on the Notice to Appear and your first immigration court hearing for what typically follows.

Practically, a detainer can mean one of a few things depending on the jail's policy:

• The jail declines to honor the hold and releases the person as scheduled on the criminal case, after which ICE may still try to locate and arrest the person separately (for example, near the courthouse, at home, or at work) — see what happens if you're detained by ICE.
• The jail honors the request, notifies ICE, and holds the person up to the 48-hour window (not counting weekends/holidays) for ICE pickup, even after the criminal matter is resolved or bail is posted.
• ICE arrives with its own administrative warrant (I-200) and takes custody directly, which can happen with or without a separately lodged detainer.

What to do if a detainer has been lodged against you or a family member

1. Find out exactly what is on file. Ask the jail's booking or records office (or the person's criminal defense attorney) whether a detainer, an administrative warrant, or a judicial warrant has been lodged, and what the facility's stated policy is on holding people past their release date.
2. Get an immigration attorney or DOJ-accredited representative involved immediately — in addition to any criminal defense lawyer. A detainer can trigger transfer to a different, sometimes distant, ICE facility, which makes it much harder to reach counsel and family once it happens.
3. Do not sign anything from ICE without understanding it first, including any form described as a "voluntary departure" or waiver of rights. Signing away rights to a hearing can be difficult or impossible to undo.
4. Exercise the right to remain silent about immigration status and the right to speak with an attorney. These rights apply regardless of citizenship or immigration status.
5. If the person is moved into ICE custody, use the ICE Online Detainee Locator System to find where they are being held, and see our guide on immigration bond and getting out of detention for next steps on custody and possible release.
6. Track deadlines closely. Once formal removal proceedings begin, court deadlines (for filings, appeals, and hearings) are often short and strictly enforced — confirm any deadline directly from the written notice or with the immigration court (EOIR) rather than relying on general information.

Beware of notario and immigration-consultant fraud

People facing a detainer or possible ICE custody are frequent targets of fraud. In the United States, only a licensed attorney or a Department of Justice-accredited representative working with a recognized organization may lawfully provide immigration legal advice or representation for a fee. A "notario público," immigration consultant, or unlicensed "case manager" who is not one of these can cost real time and money and can make an immigration case significantly worse — including missed deadlines or accidental waivers of rights. Verify credentials before paying anyone or signing anything, and when in doubt, confirm current forms and procedures directly at ice.gov, uscis.gov, or the immigration court at justice.gov/eoir.

This article is general legal information, not legal advice, and does not create an attorney-client relationship. Detainer forms, hold periods, and local compliance policies can change and vary by jurisdiction — confirm current procedures with an immigration attorney, a DOJ-accredited representative, or directly with ICE (ice.gov) or the immigration court (justice.gov/eoir). Beware of notario and immigration-consultant fraud; only a licensed attorney or DOJ-accredited representative may lawfully charge for immigration legal help.