§ 236 (8 USC 1226) Apprehension and detention of aliens
Arrest, detention, and release
On a warrant issued by the Attorney General, an alien may be arrested and detained pending a decision on whether the alien is to be removed from the United States. Except as provided in subsection (c) of this section and pending such decision, the Attorney General—
may continue to detain the arrested alien; and
may release the alien on—
may not provide the alien with work authorization (including an “employment authorized” endorsement or other appropriate work permit), unless the alien is lawfully admitted for permanent residence or otherwise would (without regard to removal proceedings) be provided such authorization.
Revocation of bond or parole
The Attorney General at any time may revoke a bond or parole authorized under subsection (a) of this section , rearrest the alien under the original warrant, and detain the alien.
Detention of criminal aliens
The Attorney General shall take into custody any alien who—
is inadmissible by reason of having committed any offense covered in section 212(a)(2) of this Act [8 U.S.C 1182(a)(2)] ,
is deportable under section 237(a)(2)(A)(i) of this Act [8 U.S.C 1227(a)(2)(A)(i)] on the basis of an offense for which the alien has been sentence to a term of imprisonment of at least 1 year, or
when the alien is released, without regard to whether the alien is released on parole, supervised release, or probation, and without regard to whether the alien may be arrested or imprisoned again for the same offense.
The Attorney General may release an alien described in paragraph (1) only if the Attorney General decides pursuant to section 3521 of title 18 that release of the alien from custody is necessary to provide protection to a witness, a potential witness, a person cooperating with an investigation into major criminal activity, or an immediate family member or close associate of a witness, potential witness, or person cooperating with such an investigation, and the alien satisfies the Attorney General that the alien will not pose a danger to the safety of other persons or of property and is likely to appear for any scheduled proceeding. A decision relating to such release shall take place in accordance with a procedure that considers the severity of the offense committed by the alien.
Identification of criminal aliens
The Attorney General shall devise and implement a system—
to make available, daily (on a 24-hour basis), to Federal, State, and local authorities the investigative resources of the Service to determine whether individuals arrested by such authorities for aggravated felonies are aliens;
to designate and train officers and employees of the Service to serve as a liaison to Federal, State, and local law enforcement and correctional agencies and courts with respect to the arrest, conviction, and release of any alien charged with an aggravated felony; and
which uses computer resources to maintain a current record of aliens who have been convicted of an aggravated felony, and indicates those who have been removed.
The record under paragraph (1)(C) shall be made available—
to inspectors at ports of entry and to border patrol agents at sector headquarters for purposes of immediate identification of any alien who was previously ordered removed and is seeking to reenter the United States, and
to officials of the Department of State for use in its automated visa lookout system.
Upon the request of the governor or chief executive officer of any State, the Service shall provide assistance to State courts in the identification of aliens unlawfully present in the United States pending criminal prosecution.
The Attorney General's discretionary judgment regarding the application of this section shall not be subject to review. No court may set aside any action or decision by the Attorney General under this section regarding the detention or release of any alien or the grant, revocation, or denial of bond or parole.