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Immigration Detainers: Background and

Recent Legal Developments



December 2, 2019

The Department of Homeland  Security (DHS) has broad authoritY to detain non-U.S. nationals (aliens)
who are subject to removal. Within DHS, Immigration and Customs Enforcoment (ICE) is primarily
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 an Immigration detainer. Under current ICE policy, 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. Recently, a federal district court in Gercto
Gonzalez v ICE ruled that ICE's use of detainers violates the Fourth Amendment's protections agamst
uinreasonable searches and seizures to the extent the agency (1) relies entirely on deficient federal
databases to determine whether an individual in criminal custody is subject to removal and (2) issues
detainers to states that do not expressly authorize LEOs to make civil immigration arrests. The district
court indicated that the court shall issue an injunction to limit these practices, but is presently considering
arguments regarding the injunction's appropriate scope. The injunction could fundamentally restrict ICE's
ability to issue detainers to state and local LEOs nationwide, with significant consequences for the
agency's efforts to remove aliens who are in state and local criminal custody.

Background on Detainers

Detainers are considered a key tool for immigration authorities to take custody of aliens who have been
arrested by state and local LEOs for violations of criminal law. The practice of issuing detainers dates
back 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 constmed as displacing the generally applicable detainer scheme. Regulations concerning
detainers generally and those specific to aliens arrested for drug offenses were eventually merged and
codified at 8 C.F.R. § 287.7, which now provides:
       Any  authorized immigration officer may at any time issue a Form 1-247, Immigration Detainer-
       Notice of Action, to any other Federal, State, or local law enforcement agency. A detainer serves
       to advise another law enforcement agency that the Department seeks custody of an alien presently
       in the custody of that agency, for the purpose of arresting and removing the alien. The detainer is a
       request that such agency advise the Department, prior to release of the alien, in order for the
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