State v. Baucum
343 P.3d 235
Or. Ct. App.2015Background
- Defendant stopped for a broken taillight; officer observed signs of intoxication and defendant admitted drinking (two beers) about an hour earlier.
- Defendant refused breath test; two blood draws under warrant showed BACs of 0.039% (first) and 0.015% (second) taken several hours after the stop.
- State offered forensic expert Michael Jackson to testify, using retrograde extrapolation to estimate defendant’s BAC at the time of the stop (calculated range 0.072%–0.121%).
- Defendant moved in limine to exclude that testimony as scientific evidence lacking the O’Key/Brown foundation; trial court held an OEC 104 hearing and admitted the testimony under OEC 702.
- Defendant was convicted for DUII and appealed, challenging admission of retrograde-extrapolation testimony on scientific-foundation grounds; appeal limited to arguments preserved at the OEC 104 hearing.
Issues
| Issue | Plaintiff's Argument (State) | Defendant's Argument | Held |
|---|---|---|---|
| Whether retrograde extrapolation is scientific evidence admissible under OEC 702 | Technique is generally accepted, peer-reviewed, testable, and admissible when expert has sufficient case facts | Technique is "junk science," unreliable and not generally accepted | Retrograde extrapolation is scientific and generally admissible when founded on adequate facts |
| Whether expert Jackson’s specific extrapolation (0.010–0.025 elimination range; assumption defendant was in elimination phase) had adequate foundation | Jackson had relevant expertise, relied on literature, known facts (time stopped, little food, test results) and explained methodology | Jackson’s rate-range and simplified calculation ignored individual variables and was thus unreliable | Jackson’s methods and range were sufficiently grounded; flaws go to weight not admissibility; testimony admissible |
Key Cases Cited
- State v. O’Key, 321 Or. 285 (establishes OEC 702 gatekeeping for scientific evidence)
- State v. Brown, 297 Or. 404 (factors for evaluating scientific evidence admissibility)
- State v. Southard, 347 Or. 127 (discusses balancing unavailable indicators with other reliability factors)
- State v. Whitmore, 257 Or. App. 664 (recognizes retrograde extrapolation as scientific evidence)
- Mata v. State, 46 S.W.3d 902 (Tex. Crim. App.) (retrograde extrapolation reliable if expert knows key case facts)
- Daubert v. Merrell Dow Pharm., 509 U.S. 579 (federal standards for admissibility focus on principles and methodology)