28 U.S. Code § 1785 - Subpoenas in multiparty, multiforum actions
When the jurisdiction of the district court is based in whole or in part upon section 1369 of this title, a subpoena for attendance at a hearing or trial may, if authorized by the court upon motion for good cause shown, and upon such terms and conditions as the court may impose, be served at any place within the United States, or anywhere outside the United States if otherwise permitted by law.
A prior section 1785, act June 25, 1948, ch. 646, 62 Stat. 950, provided a privilege against self-incrimination on examination under letters rogatory, prior to repeal by Pub. L. 88–619, § 12(a), Oct. 3, 1964, 78 Stat. 998. See section 1782(a) of this title.