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No. 10274821
United States Court of Appeals for the Ninth Circuit
United States v. Charles Porter
No. 10274821 · Decided November 15, 2024
No. 10274821·Ninth Circuit · 2024·
FlawFinder last updated this page Apr. 2, 2026
Case Details
Court
United States Court of Appeals for the Ninth Circuit
Decided
November 15, 2024
Citation
No. 10274821
Disposition
See opinion text.
Full Opinion
NOT FOR PUBLICATION FILED
UNITED STATES COURT OF APPEALS NOV 15 2024
MOLLY C. DWYER, CLERK
U.S. COURT OF APPEALS
FOR THE NINTH CIRCUIT
UNITED STATES OF AMERICA, No. 22-10286
Plaintiff-Appellee, D.C. No.
1:21-cr-00042-JLT-SKO-1
v.
CHARLES PORTER, MEMORANDUM*
Defendant-Appellant.
Appeal from the United States District Court
for the Eastern District of California
Jennifer L. Thurston, District Judge, Presiding
Argued and Submitted August 21, 2024
San Francisco, California
Before: BERZON, BRESS, and VANDYKE, Circuit Judges.
Charles Porter appeals his convictions for various sexual assault offenses
within the territorial jurisdiction of the United States after he tried to rape T.D., a
male acquaintance, in Yosemite National Park. See 18 U.S.C. §§ 113(a)(1)–(2),
113(a)(4), 2241(a)(1), 2244(b). Porter argues that the district court erred in
admitting the testimony of Porter’s former girlfriend, A.H., under Federal Rule of
*
This disposition is not appropriate for publication and is not precedent
except as provided by Ninth Circuit Rule 36-3.
Evidence 413. Under Rule 413, “[i]n a criminal case in which a defendant is accused
of a sexual assault, the court may admit evidence that the defendant committed any
other sexual assault.”
We review de novo “whether particular evidence falls within the scope of a
given rule.” United States v. Garrido, 596 F.3d 613, 616 (9th Cir. 2010) (quoting
United States v. Durham, 464 F.3d 976, 981 (9th Cir. 2006)). But “a district judge’s
ruling under Rule 403 that evidence is more probative than prejudicial is reviewed
for an abuse of discretion.” United States v. Lemay, 260 F.3d 1018, 1024 (9th Cir.
2001). In a concurrently filed opinion, we hold that Rule 413 is not facially
unconstitutional under the Fifth Amendment’s Due Process Clause. In this
memorandum disposition, we affirm the district court’s application of Rules 413 and
403 to Porter.
To begin, A.H.’s testimony fell within the scope of Rule 413 because Porter
was charged with sexual assault offenses and A.H. testified that Porter had sexually
assaulted her during their relationship. As the district court concluded, a jury could
find by a “preponderance of the evidence” that Porter sexually assaulted A.H. See
United States v. Norris, 428 F.3d 907, 913–14 (9th Cir. 2005) (quoting Huddleston v.
United States, 485 U.S. 681, 690 (1988)). Although Porter argues that his
relationship with A.H. was consensual and that A.H.’s accusations were not
corroborated, A.H. testified in some detail how Porter had frequently engaged in
2
forcible nonconsensual sex with her, including anal sex, over her objections. Based
on this record, the jury could have found by a preponderance of the evidence that
Porter sexually assaulted A.H.
Even if evidence falls within Rule 413, as here, the district court must still
evaluate whether its probative value is substantially outweighed by a danger of
unfair prejudice. See Fed. R. Evid. 403; Lemay, 260 F.3d at 1027. We have directed
that district courts should consider the following five non-exclusive factors in
conducting this Rule 403 analysis: (1) “the similarity of the prior acts to the acts
charged,” (2) the “closeness in time of the prior acts to the acts charged,” (3) “the
frequency of the prior acts,” (4) the “presence or lack of intervening circumstances,”
and (5) “the necessity of the evidence beyond the testimonies already offered at
trial.” Lemay, 260 F.3d at 1028 (quoting Doe v. Glanzer, 232 F.3d 1258, 1268 (9th
Cir. 2000)). “Prior acts evidence need not be absolutely necessary to the
prosecution’s case in order to be introduced; it must simply be helpful or practically
necessary.” Id. at 1029.
The district court did not abuse its discretion in conducting the Rule 403
analysis. The court acknowledged some differences between Porter’s assaults on
T.D. and A.H., as well as the fact that A.H. did not report Porter’s conduct to
authorities at the time. But the court also evaluated the five non-exclusive factors
and the circumstances as a whole, and it reasonably concluded that Rule 403 did not
3
warrant exclusion of A.H.’s testimony.
Among other things, the district court observed, “the acts of sexual assault
about which A.H. would testify are substantially similar to those alleged by victim
T.D,” involving “parallel accusations of strangulation, biting, and anal penetration
(or attempted anal penetration) without consent.” The district court also considered
that the assaults on A.H. and T.D. were sufficiently close in time, Porter had
frequently assaulted A.H. during their relationship, there were no intervening
circumstances, and A.H.’s testimony could corroborate T.D.’s account, of which
there were no other direct witnesses. The district court conscientiously evaluated
A.H.’s proposed testimony under Rule 403, and we cannot say that its determination
to allow A.H. to testify was an abuse of discretion.
Nor did the district court permit the government to denigrate Porter for his
sexual preferences, as Porter contends. Instead, the government introduced A.H.’s
testimony to demonstrate Porter’s propensity to commit nonconsensual sexual acts,
which Rule 413 permits. The risk of unfairness was further mitigated by the district
court’s instruction to the jury that it “may not convict the defendant simply because
he may have committed other unlawful acts.” See Lemay, 260 F.3d at 1028 (citing
a similar instruction as indication that the district court “exercised his discretion to
admit the [propensity] evidence in a careful and judicious manner”).
AFFIRMED.
4
Plain English Summary
NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS NOV 15 2024 MOLLY C.
Key Points
01NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS NOV 15 2024 MOLLY C.
02COURT OF APPEALS FOR THE NINTH CIRCUIT UNITED STATES OF AMERICA, No.
03Thurston, District Judge, Presiding Argued and Submitted August 21, 2024 San Francisco, California Before: BERZON, BRESS, and VANDYKE, Circuit Judges.
04Charles Porter appeals his convictions for various sexual assault offenses within the territorial jurisdiction of the United States after he tried to rape T.D., a male acquaintance, in Yosemite National Park.
Frequently Asked Questions
NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS NOV 15 2024 MOLLY C.
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