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Immigration Detainers: Background and

Recent Legal Developments



Updated October 9, 2020
The Department of Homeland Security (DHS) has authority to detain non-U.S. nationals (aliens) who are
subject to removal. Within DHS, Immigration and Customs Enforcement (ICE) is mainly responsible for
the arrest, detention, and removal of aliens found in the interior of the United States. If an alien whom
ICE believes to be removable is in custody by state or local law enforcement officers (LEOs), ICE may
take custody of the alien through a detainer. A detainer requests that state or local LEOs hold an alien in
their custody for up to 48 hours after the alien would otherwise be released to facilitate the alien's
removal. ICE's practice of issuing detainers has been subject to legal challenge, including on the ground
that the continued detention of an alien pending transfer to ICE custody violates the Fourth Amendment's
protections against unreasonable searches and seizures. Relying on the Fourth Amendment, a federal
district court in Gerardo Gonzalez v. ICE had enjoined ICE from issuing detainers that are (1) based
solely on information obtained from federal databases concerning an alien's potential removability, and
(2) issued to states that do not authorize LEOs to make civil immigration arrests. However, the U.S. Court
of Appeals for the Ninth Circuit reversed and vacated the court's injunction, effectively permitting ICE to
continue its detainer policy pending the outcome of the litigation, but also requiring the agency to provide
aliens subject to a detainer with a prompt probable cause determination of their removability. The
upshot is that while ICE may continue to issue detainers, it must establish the alien's removability at a
hearing before an immigration judge to justify the alien's continued detention. This Legal Sidebar
examines ICE detainers and the litigation in Gerardo Gonzalez.

Background on Detainers
Detainers are considered a key tool for immigration authorities to take custody of aliens arrested by state
and local LEOs for violating criminal law. According to ICE, about 70% of its arrests occur after
notification of an alien's impending release from criminal custody. In FY2019 alone, ICE issued more
than 160,000 detainers.
The practice of issuing detainers dates to at least the 1950s. In 1986, Congress enacted the Anti-Drug
Abuse Act, which specifically authorized the use of detainers for aliens who were arrested for violating
controlled substance laws, but has not been construed as displacing the generally applicable detainer


                                                                 Congressional Research Service
                                                                   https://crsreports.congress.gov
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