A jury convicted Linda Quam (Quam) of false declarations before a grand jury and obstruction of justice, in violation of 18 U.S.C. § 1628(a) and § 1508(a) (2000). The district court 1 sentenced Quam to fifteen months imprisonment. Quam appeals. We affirm.
I. BACKGROUND
The government subpoenaed Quam to appear before a grand jury to testify about the drug-trafficking activities of Harold Schultz (Schultz), Quam’s live-in boyfriend. Before Quam was subpoenaed, a confidential informant made a controlled buy at Schultz’s residence, and law enforcement later searched the residence. In the controlled buy, Quam observed the drug transaction and actively participated in the discussions. During the subsequent search, law enforcement discovered 111.5 grams of marijuana, 2.3 grams of methamphetamine, and various items associated with drug trafficking.
At the grand jury proceedings, the Assistant United States Attorney (AUSA) informed Quam she was being granted “informal immunity.” The AUSA explained “informal immunity” as follows:
[AUSA.] We are here to tell you that you are being granted what’s called informal immunity. What that means what you say here today can’t be used against you either directly or indirectly with respect to these drugs charges. Do you understand that?
[Quam.] Yes.
[AUSA] But you did take an oath to tell the truth and if you don’t tell the truth or omit information, you could be subject to perjury charges. Do you understand that?
[Quam.] Yes.
Quam told the grand jury she knew nothing about drugs at Schultz’s residence, never observed' Schultz selling drugs to others, and never saw Schultz use drugs.
A federal grand jury indicted Quam for false declarations before a grand jury and obstruction of justice. A petit jury convicted Quam of both crimes. Because the obstruction of justice offense carried the highest penalty, the district court based Quam’s sentence on her obstruction of justice conviction. Using United States Sentencing Guidelines (Guidelines) section 2J1.2(c)(l) (2002), the district court applied Guidelines section 2X3.1 (section 2X3.1), the accessory-after-the-fact guideline, to calculate Quam’s base offense level. Based on trial testimony, the district court made drug-quantity findings and, using a drug-trafficking offense as the underlying crime, assessed Quam’s base offense level at 14. The district court sentenced Quam to fifteen months imprisonment and two years supervised release. Quam appeals, contending (1) her grand jury testimony should be suppressed, and (2) the district court erred in using section 2X3.1 to determine Quam’s offense level.
II. DISCUSSION
A. Suppression of Grand Jury Testimony
Quam argues her grand jury testimony should be suppressed because the AUSA never informed Quam of her constitutional right against self-incrimination
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and her right to consult an attorney. Because Quam neither requested suppression of the grand jury testimony before trial, nor objected to the admission of the evidence at trial, we review for plain error. Fed.R.Crim.P. 52(b);
United States v. Wolk,
Quam’s substantial rights were not violated when the AUSA did not inform Quam of her right against self-incrimination or any right to consult counsel. “When called by the grand jury, witnesses are [] legally bound to give testimony.”
United States v. Mandujano,
Quam also asks us, using our supervisory authority, to fashion a uniform rule in our circuit for instructing grand jury witnesses. We decline to do so.
See United States v. Gomez,
We further note, upon Quam taking an oath to tell the truth, the AUSA asked Quam if she understood she could be prosecuted for perjury, if she did not tell the truth or omitted information. Quam stated she understood. The AUSA also granted Quam what the AUSA coined “informal immunity,” telling Quam “what you say here today can’t be used against you either directly or indirectly with respect to these drug[] charges.” (Emphasis added). 2 *1009 The government has not prosecuted Quam for drug trafficking. These proceedings were neither unfair nor a miscarriage of justice.
B. Sentencing
Quam contends the district court erred in using section 2X3.1 to calculate her base offense level, because no one involved in this case was indicted or convicted of a drug-trafficking offense. “The correct application of the guidelines is a question of law subject to de novo review, while a factual determination of the sentencing court is reviewed under a clearly erroneous standard.”
United States v. Tirado,
To determine Quam’s base offense level, the district court used Quam’s obstruction of justice conviction. Section '2J1.2 of Guidelines (section 2J1.2) determines the base offense level for an obstruction of justice conviction, and requires the district court apply section 2X3.1 “if the resulting offense level is greater than” the offense level provided by section 2J1.2’s other subsections and if the offense obstructed a criminal investigation or prosecution. U.S.S.G. § 2J1.2(c) (2002). Section 2X3.1 provides an accessory’s offense level is six “levels lower than the offense level for the underlying offense.” U.S.S.G. § 2X3.1. Thus, section 2X3.1 only “serves as a tool for calculating the base offense level for particularly serious obstruction offenses” under section 2J1.2,
United States v. Russell,
III. CONCLUSION
For the foregoing reasons, we affirm Quam’s conviction and sentence.
Notes
. The Honorable Rodney S. Webb, United States District Judge for the District of North Dakota.
. We have recognized “the scope of informal immunity is governed by the terms of the immunity agreement.”
United States v. McFarlane,
