United States v. Mandujano
United States Supreme Court
425 U.S. 564 (1976)
Mandujano (defendant) was subpoenaed to testify before a grand jury investigating drug trafficking; before questioning, the prosecutor told him he had a right to counsel and could be prosecuted for perjury if he lied. Mandujano testified falsely, and the government later prosecuted him for perjury, seeking to use his grand jury testimony against him. The court of appeals ordered that testimony suppressed because Mandujano had not received Miranda warnings before the grand jury questioning, and the government sought Supreme Court review.
Whether the failure to give Miranda warnings to a witness before grand jury interrogation provides grounds for suppressing the witness's statements in a later prosecution for perjury.