WHAT MATTERS MAY GRAND JURY INVESTIGATE?
Federal grand juries have exceedingly broad investigative powers.
Blair v. U.S., 250 U.S. 273 (1919);
Branzburg v. Hayes, 408 U.S. 665 (1972);
U.S. v. Dionisio, 410 U.S. 1 (1973);
In re Grand Jury Proceedings, 558 F.2d 1177 (5th Cir. 1977).
In some states (e.g. Texas), a grand jury only has authority to investigate crimes allegedly occurring within the county in which it is impaneled or other crimes specifically authorized to be prosecuted in a foreign county by statute.
Rodgers v. County of Taylor, 368 S.W.2d 794, 796-7 (Tex. App.–Eastland, 1963);
Rodriguez v. State, 918 S.W.2d 34, 36 (Tex. App.—Corpus Christi 1996).
See also U.S. v. Standard Oil Company, 316 F.2d 884 (7th Cir. 1963);
U.S. v. Chin Lim Mow, 12 F.R.D. 433 (N.D. Cal. 1952);
Application of Iaconi, 120 F. Supp. 589 (D. Mass. 1954).
