444 F.Supp.3d 1248
D. Or.2020Background:
- Defendant Odell Tony Adams charged with being a felon in possession of two .40 cal handguns after police seized a Taurus PD 24/7 Pro and a Ruger SR-40 from a crawlspace in his residence following an October 5, 2018 shooting at the Speakeasy Lounge.
- Investigators recovered shell casings at the scene; initial NIBIN testing was inconsistent but a later test returned a "presumptive match" to the Taurus; Oregon State Police examiner Travis D. Gover concluded the Taurus fired the scene casings using AFTE toolmark-comparison methods.
- Adams moved in limine under Federal Rule of Evidence 702 and Daubert to exclude or limit Gover’s expert testimony, arguing toolmark identification is inherently subjective and lacking scientific reliability.
- After multiple Daubert hearings, the Government withdrew its proffer of an identification opinion and offered only limited observational testimony (procedures, photos, and descriptive features of guns/casings) and no ultimate-match conclusion.
- The court applied Daubert, found the AFTE "sufficient agreement" methodology non-replicable and insufficiently scientific for admitting an identification opinion, and therefore excluded Gover’s match opinion while permitting limited descriptive testimony (caliber, firing-pin impressions, lands/grooves/twist descriptions).
Issues:
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Admissibility of toolmark identification under FRE 702/Daubert | Methodology is scientific, tested, published, accepted within forensics; useful to rebut CSI expectations | AFTE methodology is subjective, inscrutable, not scientifically reliable | Court excluded the match/opinion; limited testimony to observational/descriptive evidence only |
| Testability / Replicability of AFTE "sufficient agreement" standard | Method can be replicated by trained examiners; double checks and proficiency tests exist | "Sufficient agreement" is circular and lacks objective benchmarks; not reproducible even between examiners | Court found methodology not replicable in practice; this factor weighs against admissibility |
| Error rate / quality-control / peer review | Studies show low error rates (~0.9–1.5%); AFTE training, proficiency testing, review protocols provide quality control | Reported error rates vary (up to ~2.2% in black‑box studies); testing incentives and closed‑set designs understate real‑world errors; AFTE peer review is trade‑level, not scientific vetting | Court treated error‑rate evidence as neutral-to-favoring defendant and found AFTE peer review/standards inadequate under Daubert |
| Scope of testimony after Government withdrawal | Gov: can still present examiner to explain procedures, show photos, and describe observations without stating a match | Def: Even nonconclusion testimony will be misleading and confusing absent scientific basis | Court permitted limited observational testimony (caliber, firing-pin impression type, lands/grooves/twist, and that Taurus test casings showed similar impressions) but barred any match/identification opinion |
Key Cases Cited
- Daubert v. Merrell Dow Pharm., 509 U.S. 579 (1993) (sets scientific‑expert admissibility factors)
- Kumho Tire Co. v. Carmichael, 526 U.S. 137 (1999) (Daubert gatekeeping applies to technical and other specialized experts)
- United States v. Hankey, 203 F.3d 1160 (9th Cir. 2000) (discusses Daubert/Kumho application in Ninth Circuit)
- United States v. Alatorre, 222 F.3d 1068 (9th Cir. 2000) (interpreting Kumho Tire and Daubert principles)
- United States v. Downing, 752 F.2d 1224 (3d Cir. 1985) (discusses expert admissibility and general acceptance)