State v. Swinney, 345 P.3d 509

Background

Defendant convicted of multiple sexual offenses against a child (counts including first‑degree sexual abuse, rape, sodomy, and unlawful sexual penetration). Appellate review concerns admission of expert testimony on "grooming."
Victim described progressive sexual contact from ages ~7 to 13 (escalating kisses, touching over and under clothes, digital and partial penile penetration); disclosure occurred years later.
Detective Harrison, qualified at trial as an expert in child sexual abuse, testified about the concept of grooming (selection of vulnerable children, desensitization/progression of conduct, warnings to keep silence) and that the victim’s described progression fit grooming patterns.
Defendant objected that the grooming testimony was irrelevant (OEC 401 / State v. Hansen), that Harrison lacked qualifications under OEC 702 to apply grooming to defendant’s conduct, and that the testimony improperly vouched for the victim (impermissible credibility comment / OEC 403).
The trial court admitted the testimony; the court of appeals affirmed, holding (1) the grooming testimony was relevant to explain the progression and plan of abuse and to contextualize the victim’s account, (2) Harrison was sufficiently qualified to give the opinions he gave, and (3) his testimony did not constitute impermissible vouching.

Issues

Issue	Plaintiff's Argument	Defendant's Argument	Held
Admissibility (relevance) of grooming testimony under OEC 401 and Hansen	State: grooming testimony explains the victim’s progressive abuse and corroborates the account; relevant to plan/preparation	Defendant: Hansen bars using grooming‑type behaviors to infer defendant committed abuse; testimony only shows typical abuser behavior, not proof of guilt	Court: Relevant — facts here differ from Hansen; grooming evidence explained the progression central to charges and showed plan/selecting vulnerable victim
Expert qualification under OEC 702 to apply grooming to facts	State: Harrison was qualified to explain grooming generally and to apply it as context to his interview and the facts reported	Defendant: Harrison lacked required psychological/behavioral expertise and had not evaluated defendant; insufficient to opine that defendant employed grooming tactics	Court: Harrison sufficiently qualified to offer the opinions he gave; he described the behaviors as "classic elements of grooming" based on victim’s account without impermissibly asserting defendant’s mental state
Impermissible vouching / comment on victim credibility (plain error)	State: Harrison described general grooming characteristics and applied them to the victim’s description; did not assess or vouch for truthfulness	Defendant: Testimony indirectly vouched for victim and therefore should have been excluded sua sponte	Court: No plain error — testimony framed as consistency with grooming based on victim’s statements, not an assessment that victim was telling the truth; permissible corroborative/contextual testimony
OEC 403 prejudice balancing (overbreadth of Hansen)	State: Hansen is distinguishable; recent research supports probative value of grooming evidence to explain victim behavior	Defendant: Even if relevant, probative value outweighed by prejudice because it invites juror inference of guilt	Court: Distinguished Hansen and found probative value significant here; no reversible error on OEC 403 grounds

Key Cases Cited

State v. Hansen, 304 Or. 169 (Sup. Ct.) (excluded grooming‑technique evidence as irrelevant to why a victim initially denied abuse and warned about unfair inference that conduct equals perpetration)
State v. Leach, 169 Or. App. 530 (Or. Ct. App.) (evidence of grooming relevant to plan/preparation)
State v. O'Key, 321 Or. 285 (Or.) (OEC 702 gatekeeping and functions of expert testimony)
State v. Middleton, 294 Or. 427 (Or.) (expert may describe reactions of typical child victims; distinguishing vouching from permitted explanatory testimony)
State v. Remme, 173 Or. App. 546 (Or. Ct. App.) (expert testimony admissible to describe typical child victim reaction and whether particular victim’s conduct was consistent)
State v. Stafford, 157 Or. App. 445 (Or. Ct. App.) (distinguishing Hansen where grooming evidence formed gravamen of charges)
State v. Titus, 328 Or. 475 (Or.) (standard of review for trial court relevance determinations)