353 P.3d 609
Or. Ct. App.2015Background
- Early-morning parking-garage crash: defendant reversed into an unused pay booth, left the scene on foot, was later found by security and police appearing intoxicated; arrested after failing field sobriety tests.
- Breath test 2.5 hours after the incident showed BAC 0.06%; defendant told officers he stopped drinking at 2:00 a.m.
- State called OSP toxicology expert Bessett to perform retrograde extrapolation (Widmark formula) to estimate BAC at time of driving, using an elimination-rate range of 0.01–0.025% per hour and presenting a BAC range of 0.08–0.11 at the time of driving.
- Trial court admitted the expert’s retrograde-extrapolation testimony over defense OEC 104/Brown–O’Key objections; jury convicted on DUII and related counts.
- On appeal defendant argued retrograde extrapolation is not scientifically reliable and that the State failed to lay a sufficient foundation; the court reviewed admissibility de novo and affirmed.
Issues
| Issue | State's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Whether retrograde extrapolation (Widmark) is admissible scientific evidence under OEC 702/Brown–O’Key | Generally accepted, peer-reviewed basis; expert qualified; method yields a reliable range if foundation shown | Method is unreliable/junk science; expert’s foundation (choice of elimination-rate range, peak-absorption analysis) was inadequate | Retrograde extrapolation using Widmark is generally admissible when offered by a qualified expert and presented as a range |
| Whether the expert in this case met OEC 702 foundational requirements | Bessett explained training, literature basis, variables considered, and applied a conservative elimination-rate range producing a range estimate | Bessett’s elimination-rate choice and limited absorption analysis created unreliable, subjective results | The expert satisfied OEC 702: he explained methodology, relied on peer-reviewed studies, used accepted elimination-rate range, and admitted uncertainty by reporting a range |
| Whether operational standards, error rate, and literature support admissibility | Literature, peer review, and widespread use support a low-enough error rate when ranges are used; technique tested in practice | Defendant challenged variability and potential for subjective selection of variables increasing error | Court found operational standards, peer-reviewed literature, and the practice of using ranges weigh in favor of admissibility |
| Whether degree of subjectivity in application renders the method inadmissible | Formula is an objective mathematical tool; subjectivity is limited to selecting input variables and is transparent/replicable | Subjective choices (rate ranges, absorption assumptions) undermine reliability | Some subjectivity exists but does not bar admissibility because calculations are verifiable and replicable; transparency mitigates concern |
Key Cases Cited
- State v. Brown, 297 Or 404 (Oregon Supreme Court case setting standards for admissibility of scientific evidence)
- State v. O’Key, 321 Or 285 (further articulating Brown factors for scientific evidence admissibility)
- State v. Baucum, 268 Or App 649 (Or App decision recognizing general acceptance of retrograde extrapolation)
- State v. Ohotto, 261 Or App 70 (discussing expert testimony requirements for retrograde extrapolation)
- State v. Sanchez-Alfonso, 352 Or 790 (describing how experts satisfy OEC 702 by explaining methodology and basis of conclusions)