21 U.S.C. § 884 : US Code - Section 884: Immunity and privilege

Search 21 U.S.C. § 884 : US Code - Section 884: Immunity and privilege

(a) Refusal to testify
Whenever a witness refuses, on the basis of his privilege against
self-incrimination, to testify or provide other information in a
proceeding before a court or grand jury of the United States,
involving a violation of this subchapter, and the person presiding
over the proceeding communicates to the witness an order issued
under this section, the witness may not refuse to comply with the
order on the basis of his privilege against self-incrimination. But
no testimony or other information compelled under the order issued
under subsection (b) of this section or any information obtained by
the exploitation of such testimony or other information, may be
used against the witness in any criminal case, including any
criminal case brought in a court of a State, except a prosecution
for perjury, giving a false statement, or otherwise failing to
comply with the order.
(b) Order of United States district court
In the case of any individual who has been or may be called to
testify or provide other information at any proceeding before a
court or grand jury of the United States, the United States
district court for the judicial district in which the proceeding is
or may be held shall issue, upon the request of the United States
attorney for such district, an order requiring such individual to
give any testimony or provide any other information which he
refuses to give or provide on the basis of his privilege against
self-incrimination.
(c) Request by United States attorney
A United States attorney may, with the approval of the Attorney
General or the Deputy Attorney General, the Associate Attorney
General, or any Assistant Attorney General designated by the
Attorney General, request an order under subsection (b) of this
section when in his judgment -
(1) the testimony or other information from such individual may
be necessary to the public interest; and
(2) such individual has refused or is likely to refuse to
testify or provide other information on the basis of his
privilege against self-incrimination.