United States v. Sullivan

131 F.4th 776

• Court: Court of Appeals for the Ninth Circuit
• Decided: March 13, 2025
• Docket: 23-927
• Status: Published

Opinion

FOR PUBLICATION

UNITED STATES COURT OF APPEALS FOR THE NINTH CIRCUIT

UNITED STATES OF AMERICA, No. 23-927 D.C. No. Plaintiff - Appellee, 3:20-cr-00337- WHO-1 v.

JOSEPH SULLIVAN, OPINION Defendant - Appellant.

Appeal from the United States District Court for the Northern District of California William Horsley Orrick, District Judge, Presiding

Argued and Submitted October 8, 2024 San Francisco, California

Filed March 13, 2025

Before: M. Margaret McKeown, Anthony D. Johnstone, and Ana de Alba, Circuit Judges.

Opinion by Judge McKeown 2 USA V. SULLIVAN

SUMMARY *

Criminal Law

The panel affirmed Joseph Sullivan’s jury conviction for obstruction of justice and misprision of a felony arising from his efforts, while the Chief Security Officer for Uber Technologies, to cover up a major data breach even as Uber underwent investigation by the Federal Trade Commission into the company’s data security practices. Sullivan argued that the district court erred in rejecting two of his proposed jury instructions regarding the obstruction charge. • The panel held that United States v. Bhagat, 436 F.3d 1140 (9th Cir. 2006), forecloses Sullivan’s argument that the district court erred by rejecting an instruction that would have required the jury to find that there was a “nexus” between his conduct and the pending FTC proceeding. The panel explained that Supreme Court cases cited by Sullivan are not clearly irreconcilable with Bhagat. • Regarding Sullivan’s contention that the district court erred by rejecting his “duty to disclose” instruction, the panel observed that the tandem prosecution under 18 U.S.C. § 1505 (the substantive obstruction statute) and 18 U.S.C. § 2(b) (causing an act to be done) presented conjunctive theories of liability. Noting that Section 2(b) does not require a

* This summary constitutes no part of the opinion of the court. It has been prepared by court staff for the convenience of the reader. USA V. SULLIVAN 3

defendant to have a duty to disclose if prosecuted for inaction, and that Sullivan conceded that Uber was duty-bound to respond to formal FTC inquiries issued to Uber, the panel held that the validity of the Section 2(b) theory rendered the omission of the duty-to-disclose instruction proper. Sullivan argued that the evidence of his alleged misprision was insufficient as a matter of law. Misprision is the crime of “having knowledge of the actual commission of a felony” and “conceal[ing]” or failing to “as soon as possible make known the same to some judge or other person in civil or military authority under the United States.” To establish misprision, the government is obliged to show that the principal committed and completed the felony alleged. Here, that meant proving that hackers had intentionally accessed Uber’s computers without authorization and thereby obtained information from those protected computers, in violation of the Computer Fraud and Abuse Act (CFAA). • The panel held that the hackers’ illegal conduct could not be laundered through Uber’s post hoc authorization, via a non-disclosure agreement (NDA), of their computer access. • The panel held that the evidence does not support Sullivan’s claim that, even if the hackers were unauthorized within the meaning of the CFAA, he reasonably believed that the NDA cleansed the felonious access of its illegality. • The panel held that a rational jury could have found that Sullivan, who had been an Assistant U.S. Attorney in a “Computer Hacking and IP Unit,” 4 USA V. SULLIVAN

knew that the conduct in question was a felony punishable by more than a year in prison. The panel held that the district court did not abuse its discretion in permitting the introduction of the guilty plea agreement signed by one of the hackers. Any unfair prejudice did not substantially outweigh the probative value.

COUNSEL

Ross D. Mazer (argued), Assistant United States Attorney; Merry J. Chan, Chief, Appellate Section, Criminal Division; Office of the United States Attorney, United States Department of Justice, San Francisco, California; Matthew M. Yelovich, Cleary Gottlieb Steen & Hamilton LLP, Palo Alto, California; Benjamin S. Kingsley, Fenwick & West LLP, San Francisco, California; Andrew F. Dawson, Keker Van Nest & Peters LLP, San Francisco, California; for Plaintiff-Appellee. Christopher J. Cariello (argued), Orrick Herrington & Sutcliffe LLP, New York, New York; Aravind Swaminathan, Orrick Herrington & Sutcliffe LLP, Seattle, Washington; Amari L. Hammonds, Orrick Herrington & Sutcliffe LLP, Los Angeles, California; for Defendant- Appellant. Jeffrey R. Babbin and Nathan J. Guevremont, Wiggin & Dana LLP, New Haven, Connecticut; Anjali Dalal, Wiggin and Dana LLP, New York, New York; Gia L. Cincone, NACDL Amicus Committee, San Francisco, California; for Amici Curiae National Association of Criminal Defense Lawyers and Due Process Institute. USA V. SULLIVAN 5

Nathan R. Morales, Stoel Rives LLP, Portland, Oregon; Matthew D. Segal, Stoel Rives LLP, Sacramento, California; for Amici Curiae Cloud Security Alliance and Security Innovation Network.

OPINION

McKEOWN, Circuit Judge:

Cybersecurity has become a major preoccupation of businesses as network hacks and data breaches multiply. Companies now turn to seasoned experts to address these challenges. Among the ranks of these experts is Joseph Sullivan, who served as the Chief Security Officer (“CSO”) for Uber Technologies (“Uber”) from 2015 to 2017. When he began at Uber, Sullivan’s reputation was that of a “world- class” cybersecurity expert, with a stint as an Assistant U.S. Attorney and several years of private-sector leadership experience under his belt. This case arose from choices Sullivan made as Uber’s CSO in the wake of a major data breach—specifically, his efforts to cover up that breach, even as Uber underwent investigation by the Federal Trade Commission (“FTC”) into the company’s data security practices. When the breach and its cover-up came to light after having remained hidden for over a year, the government brought criminal charges against Sullivan. A jury convicted him of obstruction of justice and misprision of a felony. On appeal, Sullivan challenges several jury instructions, the sufficiency of the evidence, and an evidentiary ruling. We affirm. 6 USA V. SULLIVAN

Background In 2014, Uber experienced a data breach. A hacker discovered an Amazon Web Services (AWS) “key”—a type of log-in—embedded in code displayed publicly on GitHub, a platform on which developers store and sometimes share code. The hacker used the key to access the troves of data that Uber stored privately on AWS. From the AWS database, the hacker downloaded sensitive information pertaining to tens of thousands of Uber drivers. Shortly after this breach became public, the FTC commenced an investigation into Uber’s data security practices, including its storage of rider and driver information on AWS and the company’s “alleged deceptive statements” about those practices. In 2015, Uber hired Sullivan as its CSO. In August 2016, Sullivan took on the additional title of Deputy General Counsel. By then, Sullivan was very involved in Uber’s response to the FTC’s ongoing investigation: He made a presentation to FTC staff on Uber’s data security program, and he testified before the Commission in an investigational hearing, including on Uber’s practices of data encryption. He also supervised the preparation of at least two of Uber’s official statements to the FTC. Another data breach occurred in October 2016. Hackers gained access to Uber’s private account on GitHub—the same platform as in the 2014 attack. Embedded in the code stored in that account, the hackers found AWS keys—the same types of keys, discovered in a similar way, as in the 2014 attack. The hackers used the keys to access Uber’s AWS datastore and download the names and driver’s license numbers of some 600,000 individuals—the same type of USA V. SULLIVAN 7

breach on the same infrastructure, at an even larger scale, as in the 2014 attack. The downloaded data was unencrypted. Despite the similarities between the 2016 incident and the 2014 incident that the FTC was already investigating, no one at Uber informed the FTC of this new breach. Instead, unbeknownst to federal officials, Sullivan and a group of Uber staffers decided to track down the hackers and pressure them into signing a non-disclosure agreement (“NDA”) that purported to re-characterize the hack as “research” into “vulnerabilities” under Uber’s Bug Bounty Program. Through bug bounty programs, companies solicit and reward external security researchers’ discovery and disclosure of their systems’ vulnerabilities. See Jasmine Arooni, Debugging the System: Reforming Vulnerability Disclosure Programs in the Private Sector, 73 Fed. Comm. L.J. 443, 448–50 (2021). In ostensible exercise of the Bug Bounty Program, Uber paid the hackers $100,000 in exchange for their signatures on an NDA and an agreement to delete the downloaded data. Sullivan was involved in drafting the NDA and ultimately informed Travis Kalanick, then Uber’s Chief Executive Officer, that the hackers had signed the “contract.” 1 Sullivan did not inform Uber’s general counsel of these developments, despite telling other employees to the contrary. Sullivan also did not correct old statements, and instead signed off on new statements, to the FTC that Uber’s stores of private data on AWS were encrypted, even though the breach had exposed the fact that some of this data was unencrypted. Sullivan did so despite his and his team’s

1 The NDAs were initially signed with the hackers’ pseudonyms. After further investigation by Uber, the agreements were subsequently re- signed with the hackers’ real names. 8 USA V. SULLIVAN

awareness that he “was just deposed on this specific topic” and that news of the breach would “play very badly based on previous assertions” to the FTC about data encryption. In the fall of 2017, Uber hired a new CEO, Dara Khosrowshahi. Soon after, Sullivan informed Khosrowshahi of the hack, but he omitted and misrepresented key details: He falsely stated that no data had been downloaded; mischaracterized the timing of the payment to the hackers; and omitted the magnitude of the breach and the amount of money paid to resolve it. When Khosrowshahi discovered the truth, he fired Sullivan and publicly disclosed the breach. Upon learning of the breach, the FTC revised its complaint against Uber, withdrew acceptance of its original consent agreement with Uber, and prepared a new consent agreement that would impose additional reporting obligations on Uber. The revised complaint specifically referenced the 2016 data breach and the state of Uber’s data security as of November 2016. Meanwhile, federal prosecutors brought felony charges against one of the hackers, Vasile Mereacre, for violating the Computer Fraud and Abuse Act (“CFAA”), 18 U.S.C. § 1030. In 2019, Mereacre pled guilty. Criminal charges were also brought against Sullivan. Sullivan was then tried and convicted for obstruction of justice and misprision of a felony. After sentencing, Sullivan moved for a judgment of acquittal or a new trial on the grounds that the district court erred in formulating the jury instructions and in admitting Mereacre’s guilty plea into evidence; and that the evidence of his conviction was insufficient as a matter of law. The court denied his motion. We have jurisdiction under 28 U.S.C. § 1291. USA V. SULLIVAN 9

Analysis I. The Jury Instructions—Obstruction Conviction Sullivan claims error with respect to two of his proposed jury instructions regarding the obstruction conviction—the “nexus” instruction and the “duty to disclose” instruction. A. Nexus Instruction We review de novo the district court’s rejection of Sullivan’s proposed “nexus” instruction, which would have required the jury to find that “there was a nexus between the defendant’s conduct and the pending FTC proceeding.” 2 United States v. Munoz, 412 F.3d 1043, 1046 (9th Cir. 2005) (reviewing de novo a claim that “a jury instruction misstated an element of the charged offense”). The proposed instruction did not define “nexus.” Section 1505 provides that “[w]hoever corruptly, or by threats or force, or by any threatening letter or communication influences, obstructs, or impedes or endeavors to influence, obstruct, or impede the due and proper administration of the law under which any pending proceeding is being had before any department or agency of the United States . . . [s]hall be fined under this title, imprisoned not more than 5 years or, if the offense involves international or domestic terrorism (as defined in [S]ection 2331), imprisoned not more than 8 years, or both.” 18 U.S.C. § 1505.

2 After some back-and-forth, the parties ultimately agreed that a Section 1505 conviction necessitates a finding of a nexus between the allegedly obstructive conduct and the pending proceeding. They continue to disagree as to whether an additional instruction as to a nexus finding was required. 10 USA V. SULLIVAN

In accord with the statutory language, the jurors were instructed: “For the defendant to be found guilty [under Section 1505], the government must prove each of the following elements beyond a reasonable doubt: First, there was a proceeding pending before a department or agency of the United States; Second, the defendant was aware of the proceeding; and Third, the defendant intentionally endeavored corruptly to influence, obstruct, or impede the pending proceeding.” This instruction precisely mirrors the elements of Section 1505, as spelled out in United States v. Price, 951 F.2d 1028, 1031 (9th Cir. 1991) (“First, there must be a proceeding pending before a department or agency of the United States. Second, the defendant must be aware of the pending proceeding. Third, the defendant must have intentionally endeavored corruptly to influence, obstruct or impede the pending proceeding.” (citations omitted)). Ninth Circuit precedent forecloses Sullivan’s argument. We held in United States v. Bhagat that there is no “need to supplement the Price instructions with additional elements,” including a “nexus” element, for a conviction under Section 1505. 436 F.3d 1140, 1148 (9th Cir. 2006). Sullivan’s counsel candidly acknowledged: “the Ninth Circuit has held in a [Section] 1505 case that Aguilar’s nexus requirement did not require a separate jury instruction to that effect.” Sullivan asks us to overrule Bhagat, claiming that we have authority to do so because the case is “clearly irreconcilable” with intervening Supreme Court precedent. Miller v. Gammie, 335 F.3d 889, 900 (9th Cir. 2003) (en banc). Sullivan cites three cases that he construes as irreconcilable: United States v. Aguilar, 515 U.S. 593 (1995); Arthur Andersen LLP v. United States, 544 U.S. 696 (2005); and Marinello v. United States, 584 U.S. 1 (2018). USA V. SULLIVAN 11

Although these cases support either a “nexus” requirement or “nexus” instruction in their respective contexts, none is clearly irreconcilable with Bhagat. To begin, none of the cases concerns Section 1505. And, in each case, the statutes, facts, or jury instructions created ambiguities that called for clarification as to the existence of a “nexus.” No such ambiguities exist in Bhagat or here. The Section 1503 charge in Aguilar involved a defendant’s statement in an investigation that was “ancillary” to the proceeding covered by the statute. Aguilar, 515 U.S. at 599–601. The attenuation in the relationship between Aguilar’s act and the covered proceeding necessitated the Court’s clarification of Section 1503’s implicit “nexus” requirement. Id. at 599. The Court in Aguilar explicitly did not address jury instructions. Id. at 606. Nor are the other cases cited by Sullivan irreconcilable with Bhagat. In Marinello the prosecution was brought under the Omnibus Clause of Section 7212(a) of the Internal Revenue Code. 26 U.S.C. § 7212(a). That provision does not refer to a “proceeding,” but only to “the due administration of [the Internal Revenue Code].” 26 U.S.C. § 7212(a). The district court “did not instruct the jury that it must find that Marinello knew he was under investigation and intended corruptly to interfere with that investigation.” Marinello, 584 U.S. at 5. Given the statute’s silence and the lack of jury instruction as to either the defendant’s awareness of, or intended effect upon, any investigation, the Court clarified that the Omnibus Clause requires instruction that the government must show a “‘nexus’ between the defendant’s conduct and a particular administrative proceeding.” Id. at 13. Even if Arthur Andersen is intervening authority, and we are dubious that it is, the jury instructions in that Section 12 USA V. SULLIVAN

1512 case erroneously conveyed that the defendant need not even have “ha[d] in contemplation any particular official proceeding.” 544 U.S. at 708. The text of Section 1505, the wording of the Price instructions, and the factual relevance of only one proceeding distinguish Bhagat from Aguilar, Marinello, and Arthur Andersen. Like Bhagat, this case involved only one proceeding, of which the defendant was undisputedly aware. Under Bhagat, the Price elements require a nexus by implication, and no other jury instruction given here undermined or contradicted that implication. Sullivan was not entitled to an additional instruction that “merely duplicates” what the jury had already been told. United States v. Lopez-Alvarez, 970 F.2d 583, 597 (9th Cir. 1992). Consistent with Bhagat, we conclude that nothing more was needed. The district court did not err in declining to give Sullivan’s proposed instruction. 3 Finding no error, we decline to reach the question of harmlessness. B. The “Duty to Disclose” Instruction Sullivan also claims that the district court erred by rejecting his proposed “duty to disclose” instruction: that, if the basis of the obstruction-of-justice conviction was Sullivan’s “withholding of information, the government must prove beyond a reasonable doubt that [he] had a duty

3 Embedded in Sullivan’s arguments regarding the jury instructions is a challenge to the sufficiency of the evidence as to obstruction, based on a lack of nexus. Viewing the evidence in the light most favorable to the prosecution, we conclude that a “rational trier of fact” could have found that there was a nexus between Sullivan’s choices and the FTC proceeding, Coleman v. Johnson, 566 U.S. 650, 654 (2012), whether “nexus” is defined as “natural and probable effect” or as a “relationship in time, causation, or logic.” Aguilar, 515 U.S. at 599. USA V. SULLIVAN 13

to disclose that information to the FTC.” Sullivan contends that, without this instruction, the jury may have convicted on a theory that was invalid under Section 1505—that is, inaction by a defendant under no duty to disclose. He urges application of the Yates rule that “a verdict [is required] to be set aside in cases where the verdict is supportable on one ground, but not on another, and it is impossible to tell which ground the jury selected.” Yates v. United States, 354 U.S. 298, 312 (1957), overruled on other grounds by Burks v. United States, 437 U.S. 1 (1978). The Yates rule applies only to disjunctive charges and theories of culpability. United States v. Edwards, 303 F.3d 606, 641 (5th Cir. 2002) (“disjunctive legal theories”); Banks v. Workman, 692 F.3d 1133, 1139 (10th Cir. 2012), cert. denied sub nom. Banks v. Trammell, 569 U.S. 997 (2013) (“disjunctive charges”). Thus, if multiple “ways in which an offense may be committed” are alleged conjunctively in one count, then “proof of any one of those acts conjunctively charged may establish guilt,” and Yates is inapplicable. United States v. Bonanno, 852 F.2d 434, 441 (9th Cir. 1988). A tandem prosecution under Section 2(b) and a substantive criminal statute presents conjunctive theories of culpability. In this context, Section 2(b) “is considered embodied in full in every federal indictment.” United States v. Michaels, 796 F.2d 1112, 1118 (9th Cir. 1986), cert. denied 479 U.S. 1038 (1987); United States v. Singh, 979 F.3d 697, 717 (9th Cir. 2020) (concerning jury instruction and indictment under Section 2(b) “in conjunction with” the substantive statute). Therefore, if a theory based on the inaction of a defendant under no duty to disclose would be valid under either Section 2(b) or Section 1505, then the instruction was not in error. 14 USA V. SULLIVAN

Section 2(b) states: “[w]hoever willfully causes an act to be done which if directly performed by him or another would be an offense against the United States, is punishable as a principal.” 18 U.S.C. § 2(b). “[U]nder [Section] 2(b), a defendant may be convicted, even if he did not commit all the elements of the offense.” United States v. Ubaldo, 859 F.3d 690, 702 (9th Cir. 2017). Section 2(b) also does not require a defendant to have a duty to disclose if prosecuted for inaction. Singh, 979 F.3d at 717–18 (concluding that the defendant need not have a duty to disclose, so long as the third party who does the act has such a duty). Sullivan concedes that “Uber was duty-bound to respond to formal FTC inquiries issued to Uber.” 4 We need not reach the question of validity under Section 1505. Because the legal theories under Section 1505 and Section 2(b) are conjunctive, the validity under Section 2(b) alone renders the omission of a duty-to-disclose instruction proper. II. Sufficiency of the Evidence—Misprision Conviction We now turn to Sullivan’s argument that the evidence of his alleged misprision was insufficient as a matter of law. We review de novo. See Munoz, 412 F.3d at 1048. We must determine “whether, after viewing the evidence in the light

4 Sullivan makes a sufficiency-of-the-evidence challenge as to his willful causation of nondisclosure, based solely on the fact that he disclosed the 2016 breach to Uber’s then-CEO. This argument is neither comprehensive as to the scope of Sullivan’s alleged nondisclosure nor supported by law. It therefore fails. We do not reach Sullivan’s sufficiency-of-the-evidence challenge based on his lack of duty to disclose, as we have concluded that no such duty is required for conviction under Section 2(b). USA V. SULLIVAN 15

most favorable to the prosecution, any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt.” United States v. Laney, 881 F.3d 1100, 1106 (9th Cir. 2018) (quoting United States v. Atkinson, 990 F.2d. 501, 502 (9th Cir. 1993) (en banc)). Misprision is the crime of “having knowledge of the actual commission of a felony” and “conceal[ing]” or failing to “as soon as possible make known the same to some judge or other person in civil or military authority under the United States.” 18 U.S.C. § 4. To establish misprision, the government is obliged to show that “the principal committed and completed the felony alleged.” United States v. Ciambrone, 750 F.2d 1416, 1417 (9th Cir. 1984). Here, that meant proving that the hackers had “intentionally accesse[d]” Uber’s computers “without authorization . . . and thereby obtain[ed]” information from those “protected computer[s],” in violation of the CFAA. 18 U.S.C. § 1030(a)(2). The hackers’ use of stolen credentials to access protected, private servers was a typical CFAA violation. See hiQ Labs, Inc. v. LinkedIn Corp., 31 F.4th 1180, 1201 (9th Cir. 2022) (holding that violation occurs “when a person circumvents a computer’s generally applicable rules regarding access permissions, such as username and password requirements, to gain access to a computer”). Nobody here argues that their access, and subsequent downloading of data, was authorized beforehand. 5

5 We need not decide whether a bug bounty program may endow qualified researchers with prior authorization to access protected computers. 16 USA V. SULLIVAN

Sullivan argues that Uber’s post hoc authorization, via the NDA, retroactively rendered the hackers’ access authorized—thereby erasing their felony. But this is a false premise, inconsistent with the most plain and natural reading of the CFAA. In the statute, “without authorization” modifies the present-tense verb “accesses.” 18 U.S.C. § 1030(a)(2). An actor’s authorization, or lack thereof, is assessed at the moment of access. 6 Our prior decisions support this reading. United States v. Nosal, 844 F.3d 1024, 1038 (9th Cir. 2016) (upholding a jury instruction that “[a] person uses a computer ‘without authorization’ when the person has not received permission” and noting that the jury was to determine “whether such permission was given”) (emphases added), overruled in part on other grounds by Lagos v. United States, 584 U.S. 577 (2018); LVRC Holdings LLC v. Brekka, 581 F.3d 1127, 1135 (9th Cir. 2009) (“[A] person uses a computer ‘without authorization’ under [the CFAA] . . . when the employer has rescinded permission to access the computer and the defendant uses the computer anyway.”) (emphasis added). Because the hackers had not been given authorization by the time of access, their

6 Sullivan’s alternative interpretation would allow companies to “modify the terms of authorization after initial access” and require courts to assess “authorization” at some undetermined point after such modification. The effects of that interpretation could endanger the existence of bug bounty programs: If a company could apply modified terms retroactively, then a good-faith researcher who had accessed a computer yesterday while authorized could have that access retroactively deauthorized today. Yesterday’s access might then constitute a violation of the CFAA. Uncertainty regarding criminal liability could deter participation in bug bounty programs. And allowing post hoc authorization could encourage extortionary schemes: hackers could download sensitive data, demand a data ransom, and then insist that the company alter its bug bounty program terms to retroactively immunize their conduct. USA V. SULLIVAN 17

access was unauthorized. Their illegal conduct could not be laundered through an NDA. The government also needed to show that Sullivan had “full knowledge” “that the principal[] had committed and completed the felony alleged.” Lancey v. United States, 356 F.2d 407, 409 (9th Cir. 1966). Sullivan claims that, even if the hackers were unauthorized within the meaning of the CFAA, he reasonably believed that the NDA recharacterizing the hackers’ conduct as part of Uber’s Bug Bounty Program retroactively authorized the breach— thereby cleansing the felonious access of its illegality. Given this belief, he argues, he could not have had “full knowledge” as required for conviction of misprision. The evidence does not support this argument. By November 15, 2016, Sullivan knew that an unauthorized actor had “compromised” Uber’s accounts and potentially “acquired” data. According to his own arguments, he “believed that the hackers’ conduct was unauthorized at the time it occurred,” and he “view[ed] the legality of [the hackers’] conduct as turning on a Bug Bounty agreement.” That is, before the NDA was signed, he knew and believed that their conduct was illegal. If the NDA were really meant to cleanse the felony, it would have described the incident accurately, rather than omitting the fact that the hackers downloaded Uber’s data. And the evidence suggests that Sullivan’s beliefs did not change even after the signing: A year after the incident, Sullivan referred to the hackers as “unauthorized” in an email to Uber’s new CEO. Uber’s lawyers, too, continued to characterize the hackers as “unauthorized.” Finally, the government had to show that Sullivan knew that the conduct in question was a felony punishable by more 18 USA V. SULLIVAN

than a year in prison. “The defendant need not know the precise term of imprisonment authorized by law, but at least [he] must know the potential punishment exceeds one year in prison.” United States v. Olson, 856 F.3d 1216, 1224 (9th Cir. 2017). Sullivan had been an Assistant U.S. Attorney in a “Computer Hacking and IP Unit.” He had helped prosecute a CFAA violation; the plea agreement, which he signed, noted a maximum sentence of five years. Sullivan’s unusual “sophistication” could also be inferred “from [his] experience” as a prosecutor and cybersecurity professional. Id. As detailed above, a rational juror could have found each essential element of misprision beyond a reasonable doubt. III. Admission of Guilty Plea Finally, we address Sullivan’s contention that the district court abused its discretion in permitting the introduction of the guilty plea agreement signed by one of the hackers. We review for abuse of discretion a district court’s evidentiary ruling under Federal Rule of Evidence 403, which is not to be overturned unless it is “manifestly erroneous.” United States v. Tsarnaev, 595 U.S. 302, 322–23 (2022) (quoting Gen. Elec. Co. v. Joiner, 522 U.S. 136, 142 (1997)) There is no manifest error here. In providing that a court “may exclude relevant evidence if its probative value is substantially outweighed by a danger of . . . unfair prejudice,” Rule 403 gives the district court considerable leeway. Fed. R. Evid. 403. The probative value of the plea agreement is unquestionable. The agreement served as evidence of the specific crimes to which one of the hackers had pled guilty, including a felonious violation of the CFAA. The agreement thus proves an element of the crime with which Sullivan was charged. Even if we assess the plea USA V. SULLIVAN 19

agreement’s probative value only “relative to the other evidence in the case,” such as the hacker’s testimony, that value is still significant. Old Chief v. United States, 519 U.S. 172, 185 (1997). Any unfair prejudice to the defendant resulting from the plea’s admission into evidence does not substantially outweigh the plea’s probative value. Because the hacker and Sullivan pleaded guilty to separate crimes, the fact of this plea does not improperly impute blame for the hacker’s conduct to Sullivan. Cf. Baker v. United States, 393 F.2d 604, 614 (9th Cir. 1968) (stating the general rule that “guilty pleas of co-defendants cannot be considered as evidence against those on trial,” so that the defendant’s guilt is “determined upon the evidence against him, not on whether a Government witness or co-defendant has pleaded guilty to the same charge”), cert. denied 393 U.S. 836 (1968). Contrary to Sullivan’s arguments, the plea also does not attribute to him any particular belief. Nor are the facts within the plea likely to cause unfair prejudice, as they were subject to a limiting instruction by the district court that they were not to be taken for the truth of the matter asserted. The district court gave “adequate cautionary instruction” to mitigate prejudice. United States v. Halbert, 640 F.2d 1000, 1006 (9th Cir. 1981). We conclude that the court did not abuse its discretion in admitting the plea and therefore decline to reach the question of harmlessness. Conclusion The jury’s verdict in this case underscores the importance of transparency even in failure situations— especially when such failures are the subject of federal investigation. The verdict is not tainted by any of the claimed 20 USA V. SULLIVAN

instructional or evidentiary errors, nor can it be overturned for insufficiency of the evidence. We affirm the district court in all relevant respects. AFFIRMED.