245 P.3d 585
N.M. Ct. App.2010Background
- Parkhills own several horse ranches in southern NM; ACMG manufactures horse feed containing monensin.
- In April 2004 Parkhills purchased ACMG feed; horses across locations sickened and some mares aborted.
- NM Dept of Agriculture found monensin in feed samples; amounts ranged up to 8 grams per ton in some samples.
- Parkhills allege they developed symptoms after exposure and sought causation testimony from treating physician Dr. Koury and toxicologist Dr. Dahlgren.
- District court conducted Daubert-Alberico scrutiny; both proposed experts were excluded as unreliable under the standard.
- Horse claims settled in 2008; district court later dismissed Parkhill’s personal health claims as to health damages being the subject of this appeal.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Whether Daubert-Alberico applies to Dr. Koury’s external causation testimony | Koury’s causation opinion is based on medical expertise, not pure science. | External causation requires scientific reliability under Daubert-Alberico. | Yes; external causation testimony must meet Daubert-Alberico reliability. |
| Whether the district court properly excluded Dr. Koury’s external-causation testimony | Koury, as treating physician, is qualified to opine on causation by differential diagnosis. | External causation requires scientific reliability; Koury lacked qualifications/reliable basis. | The exclusion was proper; Koury lacked reliable basis to testify on monensin external causation. |
| Whether the district court properly excluded Dr. Dahlgren’s testimony | Dahlgren relies on differential diagnosis; should be admissible with Daubert factors. | Dahlgren lacked familiarity with monensin; methodology unreliable. | Exclusion upheld; Dahlgren’s testimony unreliable. |
| Whether differential diagnosis can establish general/specific causation in toxic tort under Rule 11-702 | Differential diagnosis is a valid basis for causation in toxic torts. | Without reliable general causation, differential diagnosis cannot show specific causation. | Court endorsed limiting external-causation testimony to reliable methods; differential diagnosis not automatically admissible. |
| Role of treating physicians in causation testimony outside workers' compensation context | Banks allows treating physicians broad leeway to diagnose and testify. | Banks does not control outside WC context; Daubert-Alberico applies where external causation is at issue. | Treating physician testimony on external causation requires Daubert-Alberico reliability; Banks not controlling here. |
Key Cases Cited
- State v. Alberico, 861 P.2d 192 ( NM 1993) (established Daubert-Alberico reliability criteria for scientific testimony)
- Torres v. State, 976 P.2d 20 ( NM 1999) (Daubert factors plus probability standard for scientific evidence)
- State v. Downey, 195 P.3d 1244 ( NM 2008) (gatekeeping and reasonableness of expert testimony under Rule 11-702)
- Banks v. IMC Kalium Carlsbad Potash Co., 134 N.M. 421 ( NM 2003) (treating-physician testimony in workers' comp context; Daubert-Alberico applicability discussed)
- McClain v. Metabolife International, Inc., 401 F.3d 1233 ( 11th Cir. 2005) (differential etiology discussion for external causation in toxic torts)
- Hollander v. Sandoz Pharms. Corp., 289 F.3d 1193 ( 10th Cir. 2002) (differential diagnosis as basis for causation in toxic torts; need reliable foundation)
- Ambrosini v. Labarraque, 101 F.3d 129 ( D.C. Cir. 1996) (differential diagnosis admissibility in toxic torts under particular conditions)
- Curtis v. M&S Petroleum, Inc., 174 F.3d 661 ( 5th Cir. 1999) (temporal relation as factor in causation assessments)
- Christian v. Gray, 65 P.3d 591 ( OK 2003) (causation proof in toxic torts; temporal relationships considered)