Nelson v. City of Pocatello, 508 P.3d 1234

Background

Richard Nelson, a 21‑year Pocatello firefighter (1993–2014), was diagnosed with early‑stage chronic lymphocytic leukemia (CLL) in 2018 and filed a timely workers’ compensation claim.
Parties stipulated that Nelson met the statutory prerequisites for the firefighter occupational‑disease presumption in Idaho Code § 72‑438(14)(b) (timing, initial medical screening, and no habitual tobacco use).
The City sought to rebut the presumption with Dr. Robert Burdick, who opined that the medical literature does not establish a probable causal link between firefighting and CLL and conceded no one can say what caused Nelson’s CLL.
The Idaho Industrial Commission held the City failed to produce “substantial affirmative evidence” of a non‑work cause and therefore did not rebut the statutory presumption.
The City appealed, arguing (1) the Commission misapplied the rebuttal standard and (2) the firefighter presumption and its “substantial evidence to the contrary” standard violate equal protection.
The Idaho Supreme Court affirmed: the statute is constitutional under rational‑basis review, the employer must present affirmative medical evidence of a non‑occupational cause to rebut the presumption, and Nelson was awarded attorney fees under I.C. § 72‑804.

Issues

Issue	Plaintiff's Argument (Nelson)	Defendant's Argument (City of Pocatello)	Held
1) Constitutionality of I.C. § 72‑438(14)(b)–(c) (equal protection)	Presumption is a permissible legislative accommodation for a class (firefighters) facing unique occupational risks; statute is rationally related to legitimate purpose.	Classification unlawfully discriminates against employers of firefighters; invites means‑focus review and fails even that test.	Statute passes rational‑basis review under Idaho Constitution; means‑focus inapplicable. Legislature reasonably targeted firefighters to address proof difficulties.
2) What constitutes “substantial evidence to the contrary” to rebut the presumption	Employer must produce substantial affirmative medical evidence showing a non‑work‑related cause for the claimant’s disease.	Presenting expert opinion and literature challenging the general linkage between firefighting and CLL suffices to rebut the presumption.	Employer must produce claimant‑specific affirmative medical proof of an alternative cause; general attacks on the statute or literature disputing the legislature’s premise are insufficient.
3) Attorney fees under I.C. § 72‑804	Nelson: City litigated without reasonable ground by attacking legislative policy rather than producing claimant‑specific contrary evidence.	City argued its constitutional and evidentiary challenges were legitimate.	Nelson awarded attorney fees; Court finds City’s challenge unreasonable and primarily an attack on statutory basis.

Key Cases Cited

Gomersall v. St. Luke's Reg'l Med. Ctr., Ltd., 168 Idaho 308, 483 P.3d 365 (Idaho 2021) (framework for equal‑protection scrutiny and rational‑basis standard under Idaho Constitution)
Olsen v. J.A. Freeman Co., 117 Idaho 706, 791 P.2d 1285 (Idaho 1990) (sets out means‑focus test and levels of scrutiny under Idaho law)
Hatley v. Lewiston Grain Growers, Inc., 97 Idaho 719, 552 P.2d 482 (Idaho 1976) (interpreting “substantial evidence to the contrary” as requiring substantial affirmative evidence by the employer)
Evans v. Hara's, Inc., 123 Idaho 473, 849 P.2d 934 (Idaho 1993) (definition of substantial evidence and employer’s burden to come forward with substantial affirmative evidence)
Politte v. Dep't of Transp., 126 Idaho 270, 882 P.2d 437 (Idaho 1994) (employer must rebut statutory presumption with medical proof; supervisory testimony insufficient)
Est. of Aikele v. City of Blackfoot, 160 Idaho 903, 382 P.3d 352 (Idaho 2016) (distinguished: pre‑presumption case where commission weighed competing medical evidence on causation)