State v. Crippen, 380 P.3d 18

Defendant Matthew Crippen lived with Victim and her family; Victim has apparent intellectual disabilities and seizures. Two weeks after he moved in, Victim accused Crippen of forcibly making her perform oral sex in a car at two locations.
Victim reported the assault the next day, provided her shirt and later boxer shorts to police; semen was found on the shorts but did not match Crippen’s DNA; no semen was found on the shirt.
While jailed, Crippen made a recorded phone call admitting oral sex with Victim, using derogatory language and recounting that he told her to put his penis in her mouth; he denied ejaculating in the call.
At trial the State did not introduce expert testimony about Victim’s cognitive capacity; the court precluded explicit evidence about her intellectual disability but acknowledged jurors might infer obvious limitations.
Victim’s testimony contained inconsistencies and volunteered that she had seizures and had been raped previously; defense argued the inconsistencies made her testimony inherently improbable and sought a mistrial on the volunteered statements.
The jury convicted Crippen of two counts of forcible sodomy; Crippen appealed arguing insufficiency (inherent improbability) and that certain volunteered statements were prejudicial and required reversal.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether Victim's inconsistent testimony was inherently improbable so as to preclude conviction	State: Victim’s core account was consistent and corroborated by Crippen’s jailhouse admission; some inconsistency expected given Victim’s limitations	Crippen: Inconsistencies made Victim’s testimony unbelievable; insufficient evidence to prove guilt beyond a reasonable doubt	Court: Testimony not inherently improbable; reasonable jury could credit Victim, especially given Crippen’s recorded admissions; conviction affirmed
Whether Victim’s volunteered statements (seizures/ prior rapes) prejudiced defendant warranting mistrial or reversal	State: Statements were inadvertent, not solicited for sympathy, had little probative impact, and were mitigated by curative instruction	Crippen: Statements improperly elicited or allowed and likely aroused sympathy, prejudicing his right to a fair trial	Court: No reversible prejudice shown; trial court did not abuse discretion in denying mistrial or excluding statements; conviction affirmed

Marks v. State, 262 P.3d 13 (Utah Ct. App. 2011) (inconsistent victim testimony not necessarily inherently improbable)
Phillips v. State, 288 P.3d 310 (Utah Ct. App. 2012) (corroboration can support child/sexual-assault testimony absent DNA)
Robbins v. State, 210 P.3d 288 (Utah 2009) (patently false testimony can warrant reversal, distinguished here)
Johnson v. State, 365 P.3d 730 (Utah Ct. App. 2015) (appellate review defers to jury factfinding where some evidence supports elements)
Hirschi v. State, 167 P.3d 503 (Utah Ct. App. 2007) (standard for reversing based on inconclusive or inherently improbable evidence)
Adams v. State, 955 P.2d 781 (Utah Ct. App. 1998) (mentally challenged witnesses are presumed competent; limitations do not automatically negate credibility)