JM 9-11.150
A grand jury may properly subpoena a subject or a target of the investigation and question the target about his or her involvement in the crime under investigation. See United States v. Wong, 431 U.S. 174, 179 n. 8 (1977); United States v. Washington, 431 U.S. 181, 190 n. 6 (1977); United States v. Mandujano, 425 U.S. 564, 573-75 and 584 n. 9 (1976); United States v. Dionisio, 410 U.S. 1, 10 n. 8 (1973). However, in the context of particular cases such a subpoena may carry the appearance of unfairness. Because the potential for misunderstanding is great, before a known "target" (as defined in JM 9-11.151) is subpoenaed to testify before the grand jury about his or her involvement in the crime under investigation, an effort should be made to secure the target's voluntary appearance. If a voluntary appearance cannot be obtained, the target should be subpoenaed only after the United States Attorney or the responsible Assistant Attorney General have approved the subpoena. In determining whether to approve a subpoena for a "target," careful attention will be paid to the following considerations:
[cited in JM 9-11.153] [updated April 2018]