RYMER, Circuit Judge:
On this appeal we are asked to slide the protections of the Sixth Amendment’s right to counsel back to a time that predates the initiation of formal criminal proceedings by nearly a year.
Darnell Hayes was one of several targets of an investigation into a complicated, multi-party scheme to sell grades for classes that foreign students did not attend, perform course work for, or take exams in. The government asked for (and got) court approval to take material witness depositions of several foreign students before they left for home. Meanwhile, the government wired a co-conspirator who agreed to cooperate and to allow the government to tape a conversation with Hayes. Hayes was subsequently indicted, and sought to exclude the tape on Massiah grounds. See Massiah v. United States, 377 U.S. 201, 84 S.Ct. 1199, 12 L.Ed.2d 246 (1964). The district court found no Massiah violation since the depositions and the taped conversation occurred before formal criminal proceedings were initiated against Hayes. Nor do we.
As the remaining issues raised on appeal do not require reversal, we affirm.
I
Beginning in 1989, Sam Koutchesfahani solicited and accepted money from Middle Eastern foreign students to gain their admission to San Diego City College (SDCC) even though they did not meet SDCC’s admissions criteria. He gave counterfeit documents to Richard Maldonado, an admissions officer, and paid him to issue fraudulent INS Form I~20s that falsely certified that the foreign students had met SDCC’s admissions requirements. Then Koutchesfahani paid instructors at SDCC, Mesa College, and Palomar College to give passing grades to students who never attended classes or took any exams.
One of these instructors was Hayes, an adjunct professor at Mesa who taught classes in marketing and business. He was also approved by Ohio University, the University of Oklahoma, and Eastern Kentucky University to administer correspondence courses. Beginning in 1992, Hayes sold approximately sixty-five passing grades in his Mesa classes to approximately thirty-one foreign students who never attended class or completed class work and examinations. Although he never dealt with the students himself, Hayes was paid $150 per grade by Koutchesfahani for the Mesa classes, and $50 per course for thirty-four foreign students in eighty-seven correspondence courses for which he fraudulently certified the examinations as properly administered. For his part, [942]*942Koutchesfahani received $109,000 from these students. As a result of Hayes’s participation in the conspiracy, these foreign students were able to maintain then-non-immigrant F-l student status and to obtain college credits and degrees.
Hayes received between $11,513 and $14,150 in bribes from Koutchesfahani, but failed to report any of this income to the IRS or to State Unemployment officials. He also claimed “head of household” status with two exemptions at a time when he knew he qualified only for “single” status with one exemption, and failed to file any tax return at all for 1992.
At some point a criminal investigation was begun into the grade selling scheme, which stopped when Koutchesfahani and the foreign students found out about the investigation in the fall of 1994. However, Hayes and Koutchesfahani continued to talk. On November 30, 1995, Hayes consented to an interview by federal agents at his home, but told them a number of things that were untrue (for example, that Middle-Eastern students attended class and he did not give passing grades to students who did not go to class; that no Middle-Eastern students were enrolled in Mesa classes in 1994; that money he received from Koutchesfahani was for marketing work on “pharmaceuticals” for Koutchesfahani’s company; and that he personally supervised the students’ correspondence exams at Mesa).
Later, when Hayes learned in March 1996 that Koutchesfahani was thinking about cooperating with the government, Hayes asked him not to cooperate against him. Nevertheless, Koutchesfahani did enter into a cooperation agreement and on May 5, 1996, allowed agents to monitor and record a conversation he had with Hayes at a coffee house. During the conversation, Hayes said that he planned to lie at trial.
In the meantime, on April 19, 1996, the government filed a motion to take pre-indictment videotaped depositions of four foreign student witnesses who were graduating and permanently returning to the United Arab Emirates. The government named Hayes and five other targets. Each target was served, but Hayes’s counsel neither objected to the motion nor attended the hearing on the motion. A magistrate judge granted the motion. A few days before May 6, 1996, when the depositions were to begin, Hayes’s privately-retained counsel substituted out and appointed counsel stepped in. The depositions took place thereafter.
On April 17, 1997, a federal grand jury indicted Hayes for conspiracy to defraud the United States in violation of 18 U.S.C. § 371, and to commit mail fraud in violation of 18 U.S.C. §§ 1341, 1346 (Count 1); aiding and abetting mail fraud-i.e., fraudulent mailings of grade reports, transcripts, and correspondence examination certifications-in violation of 18 U.S.C. §§ 2, 1341, 1346 (Counts 2-54); filing false tax returns in violation of 26 U.S.C. § 7206(1) (Counts 55-56); and failing to file a tax return in violation of 26 U.S.C. § 7203 (Count 57). After a jury trial, Hayes was convicted on all counts.
The probation office recommended a base offense level of 10 on Counts One through Fifty-four pursuant to U.S.S.G. § 2C1.7(a) (1997); a 6-level increase for loss to the government pursuant to U.S.S.G. §§ 2C1.7(b)(l)(A), 2Fl.l(b)(l)(G); and a 2-level increase for obstruction of justice pursuant to U.S.S.G. § 3C1.1, for a total offense level of 18. On Counts Fifty-five through Fifty-seven, the probation office recommended a base offense level of 7 pursuant to U.S.S.G. §§ 2Tl.l(a), 2T4.1. After adjusting for multiple counts, U.S.S.G. § 3D1.4, the probation office arrived at a total offense level of 18, a criminal history category of I, and a guidelines range of 27 to 33 months. The court adopted the presentence report and recommendation, sentencing Hayes to 30 months imprisonment, and 3 years supervised release. Hayes timely appeals both his conviction and sentence.
[943]*943II
A
Hayes argues that the tape recording of his conversation with Koutchesfahani was obtained in violation of Massiah because he had been served with a target letter on November 30, 1995, the government knew at least as of February 7, 1996 (when he was subpoenaed to appear before the grand jury) that Hayes was represented by counsel, and in May 1996 the government conducted depositions of material witnesses based on a court order. In essence, his contention is that the government created a situation leading to an invasion of the right to counsel, even though Hayes had not yet been indicted. While this may be some
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RYMER, Circuit Judge:
On this appeal we are asked to slide the protections of the Sixth Amendment’s right to counsel back to a time that predates the initiation of formal criminal proceedings by nearly a year.
Darnell Hayes was one of several targets of an investigation into a complicated, multi-party scheme to sell grades for classes that foreign students did not attend, perform course work for, or take exams in. The government asked for (and got) court approval to take material witness depositions of several foreign students before they left for home. Meanwhile, the government wired a co-conspirator who agreed to cooperate and to allow the government to tape a conversation with Hayes. Hayes was subsequently indicted, and sought to exclude the tape on Massiah grounds. See Massiah v. United States, 377 U.S. 201, 84 S.Ct. 1199, 12 L.Ed.2d 246 (1964). The district court found no Massiah violation since the depositions and the taped conversation occurred before formal criminal proceedings were initiated against Hayes. Nor do we.
As the remaining issues raised on appeal do not require reversal, we affirm.
I
Beginning in 1989, Sam Koutchesfahani solicited and accepted money from Middle Eastern foreign students to gain their admission to San Diego City College (SDCC) even though they did not meet SDCC’s admissions criteria. He gave counterfeit documents to Richard Maldonado, an admissions officer, and paid him to issue fraudulent INS Form I~20s that falsely certified that the foreign students had met SDCC’s admissions requirements. Then Koutchesfahani paid instructors at SDCC, Mesa College, and Palomar College to give passing grades to students who never attended classes or took any exams.
One of these instructors was Hayes, an adjunct professor at Mesa who taught classes in marketing and business. He was also approved by Ohio University, the University of Oklahoma, and Eastern Kentucky University to administer correspondence courses. Beginning in 1992, Hayes sold approximately sixty-five passing grades in his Mesa classes to approximately thirty-one foreign students who never attended class or completed class work and examinations. Although he never dealt with the students himself, Hayes was paid $150 per grade by Koutchesfahani for the Mesa classes, and $50 per course for thirty-four foreign students in eighty-seven correspondence courses for which he fraudulently certified the examinations as properly administered. For his part, [942]*942Koutchesfahani received $109,000 from these students. As a result of Hayes’s participation in the conspiracy, these foreign students were able to maintain then-non-immigrant F-l student status and to obtain college credits and degrees.
Hayes received between $11,513 and $14,150 in bribes from Koutchesfahani, but failed to report any of this income to the IRS or to State Unemployment officials. He also claimed “head of household” status with two exemptions at a time when he knew he qualified only for “single” status with one exemption, and failed to file any tax return at all for 1992.
At some point a criminal investigation was begun into the grade selling scheme, which stopped when Koutchesfahani and the foreign students found out about the investigation in the fall of 1994. However, Hayes and Koutchesfahani continued to talk. On November 30, 1995, Hayes consented to an interview by federal agents at his home, but told them a number of things that were untrue (for example, that Middle-Eastern students attended class and he did not give passing grades to students who did not go to class; that no Middle-Eastern students were enrolled in Mesa classes in 1994; that money he received from Koutchesfahani was for marketing work on “pharmaceuticals” for Koutchesfahani’s company; and that he personally supervised the students’ correspondence exams at Mesa).
Later, when Hayes learned in March 1996 that Koutchesfahani was thinking about cooperating with the government, Hayes asked him not to cooperate against him. Nevertheless, Koutchesfahani did enter into a cooperation agreement and on May 5, 1996, allowed agents to monitor and record a conversation he had with Hayes at a coffee house. During the conversation, Hayes said that he planned to lie at trial.
In the meantime, on April 19, 1996, the government filed a motion to take pre-indictment videotaped depositions of four foreign student witnesses who were graduating and permanently returning to the United Arab Emirates. The government named Hayes and five other targets. Each target was served, but Hayes’s counsel neither objected to the motion nor attended the hearing on the motion. A magistrate judge granted the motion. A few days before May 6, 1996, when the depositions were to begin, Hayes’s privately-retained counsel substituted out and appointed counsel stepped in. The depositions took place thereafter.
On April 17, 1997, a federal grand jury indicted Hayes for conspiracy to defraud the United States in violation of 18 U.S.C. § 371, and to commit mail fraud in violation of 18 U.S.C. §§ 1341, 1346 (Count 1); aiding and abetting mail fraud-i.e., fraudulent mailings of grade reports, transcripts, and correspondence examination certifications-in violation of 18 U.S.C. §§ 2, 1341, 1346 (Counts 2-54); filing false tax returns in violation of 26 U.S.C. § 7206(1) (Counts 55-56); and failing to file a tax return in violation of 26 U.S.C. § 7203 (Count 57). After a jury trial, Hayes was convicted on all counts.
The probation office recommended a base offense level of 10 on Counts One through Fifty-four pursuant to U.S.S.G. § 2C1.7(a) (1997); a 6-level increase for loss to the government pursuant to U.S.S.G. §§ 2C1.7(b)(l)(A), 2Fl.l(b)(l)(G); and a 2-level increase for obstruction of justice pursuant to U.S.S.G. § 3C1.1, for a total offense level of 18. On Counts Fifty-five through Fifty-seven, the probation office recommended a base offense level of 7 pursuant to U.S.S.G. §§ 2Tl.l(a), 2T4.1. After adjusting for multiple counts, U.S.S.G. § 3D1.4, the probation office arrived at a total offense level of 18, a criminal history category of I, and a guidelines range of 27 to 33 months. The court adopted the presentence report and recommendation, sentencing Hayes to 30 months imprisonment, and 3 years supervised release. Hayes timely appeals both his conviction and sentence.
[943]*943II
A
Hayes argues that the tape recording of his conversation with Koutchesfahani was obtained in violation of Massiah because he had been served with a target letter on November 30, 1995, the government knew at least as of February 7, 1996 (when he was subpoenaed to appear before the grand jury) that Hayes was represented by counsel, and in May 1996 the government conducted depositions of material witnesses based on a court order. In essence, his contention is that the government created a situation leading to an invasion of the right to counsel, even though Hayes had not yet been indicted. While this may be some other kind of problem,1 no other theory has been advanced in this case and we disagree that the Sixth Amendment rights upon which Hayes seeks reversal attached before criminal proceedings were formally instituted against him.
The Sixth Amendment provides that “[i]n all criminal 'prosecutions, the accused shall enjoy the right ... to have the Assistance of Counsel for his defence.” (Emphasis added.) Literally, these prerequisites are not met here, as there was neither a “prosecution” nor was Hayes an “accused” at the time Koutchesfahani was wound up and wired to talk to him.
Right to counsel cases in general, and the Massiah line of cases in particular, involve incidents that occurred after the initiation of adversary criminal proceedings and that arose during a critical, post-indictment proceeding. As the Court explained in United States v. Gouveia, 467 U.S. 180, 187, 104 S.Ct. 2292, 81 L.Ed.2d 146 (1984), “our cases have long recognized that the right to counsel attaches only at or after the initiation of adversary judicial proceedings against the defendant.” Then-Justice Rehnquist embraced for the majority the plurality’s description of the right to counsel in Kirby v. Illinois, 406 U.S. 682, 688-689, 92 S.Ct. 1877, 32 L.Ed.2d 411 (1972):
“In a line of constitutional cases in this Court stemming back to the Court’s landmark opinion in Powell v. Alabama [287 U.S. 45, 53 S.Ct. 55, 77 L.Ed. 158 (1932)7 it has been firmly established that a person’s Sixth and Fourteenth Amendment right to counsel attaches only at or after the time that adversary judicial proceedings have been initiated against him. [WJhile members of the Court have differed as to the existence of the right to counsel in the contexts of some of the above cases, all of those cases have involved points of time at or after the initiation of adversary judicial criminal proceedings-whether by way of formal charge, preliminary hearing, indictment, information, or arraignment.”
Gouveia, 467 U.S. at 187-188, 104 S.Ct. 2292 (quoting Kirby, 406 U.S. at 688-689, 92 S.Ct. 1877) (citations omitted). He then stated:
That interpretation of the Sixth Amendment right to counsel is consistent not only with the literal language of the Amendment, which requires the existence of both a “criminal prosecutio[n]” and an “accused,” but also with the purposes which we have recognized that the right to counsel serves. We have recognized that the “core purpose” of the counsel guarantee is to assure aid at trial, “when the accused [is] confronted with both the intricacies of the law and the advocacy of the public prosecutor.”
Id. at 188-189, 104 S.Ct. 2292. The opinion notes:
Although we have’ extended an accused’s right to counsel to certain “critical” pre[944]*944trial proceedings, United States v. Wade, 388 U.S. 218, 87 S.Ct. 1926, 18 L.Ed.2d 1149 (1967), we have done so recognizing that at those proceedings, “the accused [is] confronted, just as at trial, by the procedural system, or by his expert adversary, or by both,” United States v. Ash, supra, at 310, 93 S.Ct. 2568, 37 L.Ed.2d 619, in a situation where the results of the confrontation “might well settle the accused’s fate and reduce the trial itself to a mere formality.” United States v. Wade, supra, at 224, 87 S.Ct. 1926, 18 L.Ed.2d 1149.
Id. at 189, 104 S.Ct. 2292. And adds:
Thus, given the plain language of the Amendment and its purpose of protecting the unaided layman at critical confrontations with his adversary, our conclusion that the right to counsel attaches at the initiation of adversary judicial criminal proceedings “is far from a mere formalism.” It is only at that time “that the government has committed itself to prosecute, and only then that the adverse positions of government and defendant have solidified. It is then that a defendant finds himself faced with the prosecutorial forces of organized society, and immersed in the intricacies of substantive and procedural criminal law.”
Id. (quoting Kirby, 406 U.S. at 689, 92 S.Ct. 1877) (citation omitted). “It is this point, therefore, that marks the commencement of the ‘criminal prosecutions’ to which alone the explicit guarantees of the Sixth Amendment are applicable.” Kirby, 406 U.S. at 690, 92 S.Ct. 1877 (emphasis added).
Massiah itself, of course, involved post-indictment contact. The defendant was indicted for violating the federal narcotics laws, retained a lawyer, pleaded not guilty, and was released on bail. While the defendant was free on bail, a federal agent succeeded by surreptitious means in listening to incriminating statements made by the defendant to his alleged co-conspirator, who was cooperating with the government, and the statements were introduced at trial. The Court held that a defendant is denied the basic protections of the Sixth Amendment “when there was used against him at his trial evidence of his own incriminating words, which federal agents had deliberately elicited from him after he had been indicted and in the absence of his counsel.” Massiah, 377 U.S. at 206, 84 S.Ct. 1199 (emphasis added). As it stated, “[a]ny secret interrogation of the defendant, from and after the finding of the indictment, without the protection afforded by the presence of counsel, contravenes the basic dictates of fairness in the conduct of criminal causes and the fundamental rights of persons charged with crime.” Id. at 205, 84 S.Ct. 1199 (emphasis added) (internal quotations omitted).
The law in this circuit is likewise limited. In United States v. Kenny, 645 F.2d 1323 (9th Cir.1981), we explicitly rejected a Massiah challenge to a tape recording made by an informant of a conversation with a defendant (who was represented by counsel) before his indictment. As we noted, Kenny had not been charged, arrested or indicted at the time of the recording:
The short answer to Kenny’s contention that his right to counsel was breached is that the right to counsel is not viewed to attach prior to the initiation of adversary judicial proceedings against an accused. Where a case is still in the investigative stage, or in the absence of a person’s being charged, arrested, or indicted, such adversary proceedings have not yet commenced, and thus no right to counsel has attached.
Id. at 1338 (citation omitted). Similarly, we held in United States v. DeVaughn, 541 F.2d 808 (9th Cir.1976), that Massiah was not implicated by taping a telephone call made to a defendant after a felony complaint against him had been dismissed, but before he was prosecuted again.
The difficulty in this case comes from the fact that witness depositions pursuant to Federal Rule of Criminal Procedure 15 have the trappings of trial about them. By definition they are “for use at trial,” and contemplate the “defendant’s” presence (along with his counsel), examination, [945]*945cross-examination, production of prior statements, and trial-type limitations on the scope and manner of taking testimony.2 At the same time, Rule 15 depositions may be used at trial only if an indictment is returned, the depositions are relevant to the charges, and the witnesses don’t show up.
Were resemblance to trial the standard, we would have less trouble saying the Sixth Amendment was triggered. But it isn’t. Instead, we believe that the Supreme Court meant what it said in Ash, that Kirby “forecloses application of the Sixth Amendment to events before the initiation of adversary criminal proceedings.” United States v. Ash, 413 U.S. 300, 303 n. 3, 93 S.Ct. 2568, 37 L.Ed.2d 619 (1973). Nor would we have trouble saying the Sixth Amendment was triggered if being a target were enough. But it isn’t, either. As the Court has made clear, the Sixth Amendment “attaches only at or after the initiation of adversary judicial proceedings against the defendant.” Gouveia, 467 U.S. at 187, 104 S.Ct. 2292; see also Kenny, 645 F.2d at 1338. Although the depositions were preceded by adversary judicial proceedings against the witnesses, none had been initiated against Hayes. And because the depositions were only to preserve the testimony of the departing students for trial if there were a trial and a student did not return, we cannot say that the government “committed” itself to prosecuting Hayes (or any of the other targets) when it sought to take them.
In sum, the Supreme Court, this court, and every other circuit has said that adversary judicial proceedings are initiated “by way of formal charge, preliminary hearing, indictment, information, or arraignment,”3 which a motion for taking witness depositions is not. This is a clean and clear rule that is easy enough to follow: initiating any of these specific proceedings “marks the commencement of the ‘criminal prosecutions’ to which alone the explicit guarantees of the Sixth Amendment are applicable.” Kirby, 406 U.S. at 690, 92 S.Ct. 1877. We are loath to en-graft some new proceeding onto the rule, thereby making it no longer clean and clear.
Instead, we hold that Massiah was not implicated and Hayes’s Sixth Amendment rights were not infringed because criminal proceedings had not been formally initiated against him.
B
Alternatively, Hayes maintains that the recording ran afoul of his rights under Miranda v, Arizona, 384 U.S. 436, 86 S.Ct. 1602, 16 L.Ed.2d 694 (1966). This cannot [946]*946be so, however, as Hayes voluntarily met Koutchesfahani at a coffee house. It was a non-custodial encounter, to which Miranda does not apply. See id. at 444, 86 S.Ct. 1602.
Ill
Hayes argues that his strong, almost familial relationship with Koutchesfahani was insufficient to show that he knew of the conspiracy. However, “a defendant’s knowledge of and participation in a conspiracy may be inferred from circumstantial evidence and from evidence of the defendant’s actions.” United States v. Calabrese, 825 F.2d 1342, 1348 (9th Cir.1987) (internal quotations omitted).
Viewing the evidence and all inferences reasonably drawn from it in the light most favorable to the government, as we must, it was more than sufficient. Koutchesfa-hani testified that Hayes received $150 per grade for sixty-five passing grades to thirty-one foreign students whom Hayes had never met or required to attend class, yet for whom he signed and wrote notes on “add cards.” When students failed to pay for a passing grade, Hayes gave them an “incomplete.” Koutchesfahani also testified that he paid Hayes $50 for each of eighty-seven correspondence courses that Hayes fraudulently certified as properly administered to thirty-four foreign students. This was corroborated by school administrators and the foreign students. In addition, the evidence showed that some of the students were not in the United States, or were at other schools, when Hayes represented they were attending his classes or taking exams. Further, Hayes tried to cover up the nature of his relationship with Koutchesfahani and the grade passing scheme.
The same is true of the tax charges. The government must, and did prove, that Hayes was required to file a return but did not, and that the failure was willful. 26 U.S.C. § 7203; United States v. Vroman, 975 F.2d 669, 671 (9th Cir.1992). Hayes did not file a 1992 return or report either his wages from SDCC or money he received from Koutchesfahani. He had a graduate degree in business and a paralegal degree, and filed returns before and after 1992. Likewise, the evidence was sufficient to support Hayes’s conviction for filing false tax returns in violation of 26 U.S.C. § 7206(1), which requires that he made and subscribed a return that was incorrect as to a material matter; the return contained a written declaration that it was made under the penalties of perjury; he did not believe the return to be true and correct as to every material element; and he falsely subscribed to the return with the specific intent to violate the law. See United States v. Marabelles, 724 F.2d 1374, 1380 (9th Cir.1984). Hayes reported none of the money he received from Koutchesfahani, which was obviously material to the IRS’s ability correctly to calculate Hayes’s tax liabilities.
IV
Hayes asserts that he should have been allowed to cross-examine Koutchesfahani about a pending investigation into an application for disability benefits that Koutchesfahani’s wife filed with the Social Security Administration. However, the district court was well within its discretion in precluding this line of inquiry, for Koutchesfahani did not sign the application, was not a target of this investigation, and was otherwise substantially impeached. See United States v. Bonanno, 852 F.2d 434, 439 (9th Cir.1988).
V
Hayes further contends that he should have been permitted to testify as a “custodian of records” to show that he kept documents which he submitted to the grand jury in the normal course of his business, without cross-examination by the government beyond his role as custodian. The district court ruled otherwise before trial, and Hayes did not take the stand. Because he did not take the stand, we decline to review the issue. See Luce v. [947]*947United States, 469 U.S. 38, 43, 105 S.Ct. 460, 83 L.Ed.2d 443 (1984); United States v. Behanna, 814 F.2d 1318, 1321 (9th Cir.1987).
VI
Hayes maintains that the district court erred in enhancing his sentence for obstruction of justice because its finding did not encompass all of the factual predicates for a finding of perjury, as United States v. Dunnigan, 507 U.S. 87, 113 S.Ct. 1111, 122 L.Ed.2d 445 (1993), requires. We disagree. The district court did not base its finding on perjurious trial testimony, but on the ground that Hayes submitted false documents to the grand jury; urged Koutchesfahani to lie to conceal Hayes’s role, suggesting among other things that a defense could be that the students paid a “ringer” to sit in his classes and take the exams; and asked Koutchesfahani not to cooperate against him. We review a district court’s factual determination under § 8C1.1 of the Sentencing Guidelines for clear error, and a district court’s characterization of a defendant’s conduct as obstruction de novo. See United States v. Shetty, 130 F.3d 1324, 1333 (9th Cir.1997), cert. denied, — U.S. -, 118 S.Ct. 1525, 140 L.Ed.2d 676 (1998). Having done so, we are not firmly convinced that Hayes’s conduct did not fall within the guidelines, as he attempted to suborn perjury and produced a false record during the grand jury proceedings. See U.S.S.G. § 3C1.1 cmt. 2, 3(b), 3(c).
VII
Hayes submits that the district court erred in failing to give him a minor role adjustment under § 3B1.2 of the Sentencing Guidelines because he was a dupe of Koutchesfahani and the unwitting signer of documents at Koutchesfahani’s request. In short, he contends that Koutchesfahani ran the show, not him. However, we see no clear error, see United States v. Ladum, 141 F.3d 1328, 1348 (9th Cir.), cert. denied, — U.S. -, 119 S.Ct. 549, 142 L.Ed.2d 457 (1998), for as the district court found, Hayes’s role in the conspiracy was anything but minor. Without him, the scheme could not have worked; Hayes gave thirty-one students passing grades in sixty-five classes which the students never attended and for which they completed no class work or examinations, and Hayes falsely certified eighty-seven correspondence course examinations as properly administered to thirty-four foreign students who never took them. He was paid handsomely for his efforts, which he failed to report to the IRS. And he went to great lengths to cover up the conspiracy.
VIII
Hayes argues that the district court should not have refused his requests for downward departure based on aberrant behavior, charitable good works, and physical condition, but the court simply declined to exercise its discretion in favor of a downward departure without indicating that it lacked authority to do so. For this reason we have no authority to review its decision. See United States v. Govan, 152 F.3d 1088, 1095 (9th Cir.1998).
AFFIRMED.