...be authorized or designated for that purpose by the Attorney General. "§2514. Immunity of witnesses "Whenever in the judgment of a United States attorney...grand jury or court of the United States involving any violation of this chapter or any of the offenses enumerated in section 2516, or any conspiracy...

..."SEC. 869f. (a) Whenever, in the judgment of the United States attorney for the District of Columbia, the testimony of any witness, or the production of books, papers, or other records or documents, by any witness, in any case or proceeding involving a violation of this subchapter...

...thereof and adding thereafter the following: "(b) Whenever in the judgment of the Attorney General the testimony of any witness, or the production of books, papers, or other records or documents by any witness, in any case or proceeding before any grand jury or court of the...

..."SEC. 869f. (a) Whenever, in the judgment of the United States attorney for At District of Columbia, the testimony of any witness, or the production of books, papers, or other records or documents, by any witness, in any case or proceeding involving a violation of this subchapter...

...with respect thereto prior to the entrance into the record of the order of the district court. "(c) Whenever in the judgment of a United States attorney...grand jury or court of the United States involving any interference with or endangering of, or any plans or attempts to interfere with or endanger, the...

...petitioner to testify before a grand jury. The Immunity Act, in its pertinent portions, provides: "(c) Whenever in the judgment of a United States attorney...grand jury or court of the United States involving any interference with or endangering of, or any plans or attempts to interfere with or endanger, the...

...SEC. 7494. SPECIAL PROVISIONS RELATING TO NARCOTIC DRUGS AND MARIHUANA. (a) IMMUNITY OF WITNESSES. — Whenever in the judgment of a United States attorney...grand jury or court of the United States involving any violation of — (1 ) any provision of part I or part II of subchapter A of chapter 89 the penalty...

...with respect thereto prior to the entrance into the record of the order of the district court. "(c) Whenever in the judgment of a United States attorney...grand jury or court of the United States involving any interference with or endangering of, or any plans or attempts to interfere with or endanger, the...

...both. "(e) No witness shall be excused from testifying or producing books, papers, or other evidence in any case or proceeding before any grand jury or court of the United States involving violations of, or conspiracies to violate, this section on the ground that the testimony or evidence...

...both. (b) No witness shall be excused from testifying or producing books, papers, or other evidence In any case or proceeding before any grand jury or court of tie United States involving violations of, or conspiracies to violate, this section on the ground that...