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No. 10660027
United States Court of Appeals for the Ninth Circuit
United States v. Sylvia Olivas
No. 10660027 · Decided August 25, 2025
No. 10660027·Ninth Circuit · 2025·
FlawFinder last updated this page Apr. 2, 2026
Case Details
Court
United States Court of Appeals for the Ninth Circuit
Decided
August 25, 2025
Citation
No. 10660027
Disposition
See opinion text.
Full Opinion
NOT FOR PUBLICATION FILED
UNITED STATES COURT OF APPEALS AUG 25 2025
MOLLY C. DWYER, CLERK
U.S. COURT OF APPEALS
FOR THE NINTH CIRCUIT
UNITED STATES OF AMERICA, No. 20-50182
Plaintiff-Appellee, D.C. No.
2:16-cr-00390-DSF-AB-4
v.
SYLVIA OLIVAS, AKA Sylvia Lee MEMORANDUM*
Gavaldon,
Defendant-Appellant.
On Remand from the United States Supreme Court
Argued and Submitted April 7, 2025
San Francisco, California
Before: HURWITZ, R. NELSON, and BUMATAY, Circuit Judges.
Sylvia Olivas appeals convictions under the Racketeer Influenced and Corrupt
Organizations Act (RICO), 18 U.S.C. §§ 1961–68, stemming from her involvement
in criminal activities of the Canta Ranas Organization. We affirm.
1. The district court erred by admitting expert testimony from Officer
Robert Rodriguez, Rene Enriquez, and Drug Enforcement Administration Agent
Steve Paris without making express reliability findings. See United States v.
*
This disposition is not appropriate for publication and is not precedent
except as provided by Ninth Circuit Rule 36-3.
Holguin, 51 F.4th 841, 855 (9th Cir. 2022). But the error was harmless because the
record demonstrates the reliability of these experts. See United States v. Ruvalcaba-
Garcia, 923 F.3d 1183, 1190 (9th Cir. 2019) (per curiam).
“Officers may testify about their interpretations of ‘commonly used drug [or
gang] jargon’ based solely on their training and experience.” United States v. Vera,
770 F.3d 1232, 1241 (9th Cir. 2014) (quoting United States v. Bailey, 607 F.2d 237,
240 (9th Cir. 1979)). The record reveals that the experts had ample training and
experience. Rodriguez served as a patrol officer and member of the “Problem-
Oriented Policing Team” investigating drug and gang crimes for over a decade. He
received over 100 hours of gang-specific training, participated in “[w]ell over 100”
criminal investigations, including Canta Ranas, and had contacts with around 50
Canta Ranas members specifically. Enriquez was inducted into the Mexican Mafia,
held a position of authority within it, and was familiar with the organization’s
internal politics. Paris participated in thousands of drug-related investigations
related to street gangs, conducted drug-related undercover work, and worked with
several confidential informants to investigate drug trafficking.
2. The district court did not err in admitting dual-role testimony from
Officer Rodriquez and Enriquez. Although “we encourage district courts to ‘clearly
separate’” lay and expert testimony, United States v. Rodriguez, 971 F.3d 1005, 1019
(9th Cir. 2020), there is no single prescribed method to do so. A district court may
2
itself “clarify in the eyes of the jury the demarcation between lay and expert
testimony,” but “[t]hat distinction can also be revealed through direct or cross
examination.” United States v. Freeman, 498 F.3d 893, 904 (9th Cir. 2007). In this
case, the government repeatedly announced before the jury when it shifted from
“lay” to “expert” testimony.
The district court also did not plainly err by giving the Ninth Circuit’s model
dual-role testimony instruction, which the parties jointly proposed, at the end of trial
rather than during testimony. We have found plain error only where no dual-role
instruction was given at all. See United States v. Torralba-Mendia, 784 F.3d 652,
659 (9th Cir. 2015) (citing Vera, 770 F.3d at 1246). Even if it might be prudent to
provide a dual-role instruction during witness testimony, failure to do so is not plain
error. See Holguin, 51 F.4th at 863–64.
Enriquez’s previous involvement with David Gavaldon, the gang leader at the
core of the RICO conspiracy, also did not warrant exclusion. Enriquez’s testimony
was grounded in his personal experiences and “rationally based on [his] perception.”
Fed. R. Evid. 701(a). The record does not suggest any continued affiliation between
Enriquez and the Mexican Mafia during the alleged conspiratorial acts, the earliest
of which occurred two years after Enriquez left the gang.
3. Nor did the district court err in admitting Enriquez’s opinion that
Olivas’s actions suggested that she acted as a secretary for the gang. Expert
3
witnesses are “not permitted to offer a direct opinion on the defendant’s guilt or
innocence,” Freeman, 498 F.3d at 906, but Enriquez asserted no such thing, see
United States v. Fleishman, 684 F.2d 1329, 1335–36 (9th Cir. 1982) (expert may
testify that defendant was the “lookout” in a drug-trafficking operation).1
4. The district court did not err in permitting Case Agent Aaron Gutierrez
to testify. A law enforcement officer may testify about the meaning of ambiguous
recorded statements based on the officer’s “direct perception” of intercepted
communications coupled with “other facts he learned during the investigation.”
United States v. Gadson, 763 F.3d 1189, 1207 (9th Cir. 2014) (quoting Freeman,
498 F.3d at 904–05). “Such testimony is admissible even if the testifying officer
was not a participant in the recorded conversation.” Id. “A lay witness’s opinion
testimony necessarily draws on the witness’s own understanding, including a wealth
of personal information, experience, and education, that cannot be placed before the
jury.” Id. at 1208; see also Holguin, 51 F.4th at 865 (“We have allowed officers to
interpret communications based on the investigation as a whole and have not
required all information supporting lay opinion to be placed before the jury.”).
Gutierrez reviewed prison correspondence that he personally collected and
other materials he secured throughout his years-long investigation. The foundation
1
We address Olivas’s additional argument that Enriquez’s testimony violated
Federal Rule of Evidence 704(b) in a separately filed opinion.
4
laid concerning Gutierrez’s investigation supported his lay opinions. See United
States v. Barragan, 871 F.3d 689, 703–04 (9th Cir. 2017). This evidence was also
“rationally based on the witness’s perception” from his investigative activity. Vera,
770 F.3d at 1242 (quoting Fed. R. Evid. 701).
5. Any error in the formulation of the instructions concerning RICO
conspiracy was harmless. See Rodriguez, 971 F.3d at 1012 (“Jury instructions must
be evaluated ‘as a whole, and in context,’ rather than in piecemeal.” (quoting United
States v. Stapleton, 293 F.3d 1111, 1114 (9th Cir. 2002))). The instructions
adequately stated the mens rea necessary for conviction, requiring the jury to find an
agreement between two or more persons to conduct or to participate in the conduct
of the affairs of the enterprise through a pattern of racketeering activity, and that
Olivas joined that conspiracy by willfully participating in it while knowing of its
object and intending to help further or facilitate the scheme. The instructions
therefore captured the underlying offense and the role required of Olivas. See Smith
v. United States, 568 U.S. 106, 110 (2013) (“To convict a defendant of narcotics or
RICO conspiracy, the Government must prove beyond a reasonable doubt that two
or more people agreed to commit a crime covered by the specific conspiracy statute
(that a conspiracy existed) and that the defendant knowingly and willfully
participated in the agreement (that he was a member of the conspiracy).”); Salinas
v. United States, 522 U.S. 52, 65 (1997) (holding that although a conspirator “must
5
intend to further an endeavor which, if completed, would satisfy all of the elements
of [the underlying] criminal offense, . . . it suffices that he adopt the goal of
furthering or facilitating the criminal endeavor”).
6. Any error in the mens rea instruction for drug conspiracy redounded to
Olivas’s benefit and does not warrant reversal. See United States v. Collazo, 984
F.3d 1308, 1318–19 (9th Cir. 2021) (en banc); United States v. Irons, 31 F.4th 702,
717 (9th Cir. 2022) (similar instruction “provide[d] no grounds for reversal” because
“[a]t worst, the instruction required the Government to prove more than Collazo
required, but not less”).
7. The district court did not err in refusing Olivas’s proposed “willfully”
instruction for her money-laundering charge. Because the instructions noted that the
jury may not find guilt if it found Olivas did not think she was engaging with
unlawful activity, willfulness was adequately outlined. See Salinas, 522 U.S. at 65.
8. The district court did not plainly err by giving the general “knowingly”
instruction. Olivas’s argument largely turns on the comments to the model money-
laundering instruction. But the model instructions are not authoritative, and their
comments are “only instructive at best.” United States v. Saini, 23 F.4th 1155, 1162
(9th Cir. 2022). And given the overwhelming evidence of Olivas’s participation in
the gang’s money-laundering scheme, she has not shown that any plain error affected
her substantial rights or the fairness of the proceedings.
6
9. The district court did not erroneously admit statements about “La
Senora” under the co-conspirator hearsay exception. “Under Federal Rule of
Evidence 801(d)(2)(E), a statement of one coconspirator is admissible nonhearsay
against other coconspirators as an admission of a party-opponent, if the statement
was made during the course of and in furtherance of the common objectives of the
conspiracy.” United States v. Tamman, 782 F.3d 543, 553 (9th Cir. 2015).
The district court’s determination that these statements were made in
furtherance of the conspiracy is not clearly erroneous.2 United States v. Moran, 493
F.3d 1002, 1010 (9th Cir. 2007) (per curiam). These statements fall under the
exception because they “further the common objectives of the conspiracy or set in
motion transactions that are an integral part of the conspiracy.” United States v.
Yarbrough, 852 F.2d 1522, 1535 (9th Cir. 1988). Statements made to “higher ups”
may be “in furtherance” of the conspiracy. See id. at 1536 (citing United States v.
Moody, 778 F.2d 1380, 1382 (9th Cir. 1985)).
AFFIRMED.
2
Nor were the statements unduly prejudicial, as they did not directly implicate
Olivas. See United States v. Williams, 423 F.2d 696, 696 (9th Cir. 1970) (per curiam)
(finding no error in admission of statements that did not implicate appellant).
7
Plain English Summary
NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS AUG 25 2025 MOLLY C.
Key Points
01NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS AUG 25 2025 MOLLY C.
02COURT OF APPEALS FOR THE NINTH CIRCUIT UNITED STATES OF AMERICA, No.
03SYLVIA OLIVAS, AKA Sylvia Lee MEMORANDUM* Gavaldon, Defendant-Appellant.
04On Remand from the United States Supreme Court Argued and Submitted April 7, 2025 San Francisco, California Before: HURWITZ, R.
Frequently Asked Questions
NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS AUG 25 2025 MOLLY C.
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This case was decided on August 25, 2025.
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