Gorre v. City of Tacoma ( 2015 )


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  •   F ll E
    1~1   Cl.i:RKS OFFICE
    This opinion was flied for r'ecora
    at ;'   :ro·         · : ·.
    IN THE SUPREME COURT OF THE STATE OF WASHINGTON
    EDWARD 0. GORRE,                           )
    )     No. 90620-3
    Respondent,      )
    )
    v.                              )     En Bane
    )
    CITY OF TACOMA,                            )
    )
    Petitioner,      )
    )
    and                             )
    )
    DEPARTMENT OF LABOR AND                    )
    INDUSTRIES,                                )     Filed      AUG 2 7 2015
    )
    Defendant.       )
    _________________ )
    Yu, J.--This is an appeal from a denial of a workers' compensation claim.
    Under the Industrial Insurance Act (Act), Title 51 RCW, a worker injured in the
    course of employment suffers from an "occupational disease" and is entitled to
    certain benefits. The burden of proving an occupational disease generally falls on
    the worker. That is, to receive benefits an injured worker typically must show that
    Gorre v. City of Tacoma, No; 90620-3
    his or her injury arose naturally and proximately from employment. This case
    involves an exception that shifts that burden in certain circumstances.
    Under RCW 51.32.185(1), a firefighter who suffers from any of four
    enumerated classes of injury receives a rebuttable evidentiary presumption that the
    injury is an occupational disease. At issue here are two of those presumptive classes
    of occupational disease:
    ( 1) In the case of firefighters . . . there shall exist a prima facie
    presumption that: (a) Respiratory disease; . . . and (d) infectious
    diseases are occupational diseases. .            This presumption of
    occupational disease may be rebutted by a preponderance of the
    evidence ....
    (4) The presumption [for infectious diseases] shall be extended
    to any firefighter who has contracted any of the following infectious
    diseases: Human immunodeficiency virus/acquired immunodeficiency
    syndrome, all strains of hepatitis, meningococcal meningitis, or
    mycobacterium tuberculosis.
    RCW 51.32.185 (emphasis added).          A firefighter who does not qualify for
    RCW 51.32.185(1)'s presumption may still receive benefits, but he or she retains
    the burden of proof.
    Edward 0. Gorre, a firefighter employed by the city of Tacoma (City), suffers
    from valley fever (coccidioidomycosis). Gorre's diagnosis is not disputed. At issue
    instead is whether valley fever is a "respiratory disease" or an "infectious disease"
    under RCW 51.32.185(1)(a) or (d) that shifts the burden of proving the disease's
    2
    Gorre v. City of Tacoma, No. 90620-3
    proximate cause from Gorre to the employer City.           The answer involves two
    questions of statutory interpretation.
    First, we must interpret "respiratory disease" in RCW 51.32.185(1)(a). Gorre
    asks us to affirm the Court of Appeals, which adopted the term's ordinary dictionary
    definition. The City urges us to interpret it as a term of art, limiting respiratory
    diseases to what doctors diagnose as such. Second, we must interpret the scope of
    RCW 51.32.185(1)(d)'s presumption for "infectious diseases" and specifically what
    RCW 51.32.185(4) means by stating that the presumption "shall be extended to"
    HIV and AIDS, hepatitis, meningitis, and tuberculosis. The issue is whether that list
    of diseases is exclusive. The Court of Appeals held it was not, interpreting RCW
    51.32.185(1 )(d) to cover every infectious disease, including valley fever.
    We reverse the Court of Appeals and reinstate the superior court's judgment
    in the City's favor.    We conclude that "respiratory disease," as used in RCW
    51.32.185(1 )(a), refers only to diseases that medical experts diagnose as respiratory
    diseases.   We also conclude that the "infectious diseases" qualifying for RCW
    51.32.185(1)(d)'s evidentiary presumption are limited to those diseases specifically
    enumerated in RCW 51.32.185(4 ). Because medical experts in Gorre's case testified
    that valley fever is an infectious disease, not a respiratory one, and because it is not
    one of the infectious diseases enumerated in RCW 51.32.185(4), the presumption
    does not apply.
    3
    Gorre v. City of Tacoma, No. 90620-3
    BACKGROUND
    A firefighter employed by the City since 1997, Gorre fell ill shortly after
    returning to Washington from a trip to Las Vegas, Nevada. His diagnosis was
    initially a mystery. Doctors went through several tentative diagnoses before a skin
    biopsy tested positive for valley fever. Valley fever is a fungal infection endemic to
    the desert southwest, including Nevada and especially California's San Joaquin
    Valley (where the name derives). The fungus favors warm, dry climates, and though
    it lives in the desert's arid soil, it releases spores into the air if the soil is disturbed.
    Humans acquire valley fever by inhaling those spores.
    Gorre filed for workers' compensation benefits with the City and the
    Department of Labor and Industries. After both entities rejected his claim, Gorre
    appealed to the Board of Industrial Insurance Appeals (Board). His administrative
    appeal included both procedural and factual components. As to procedure, Gorre
    asserted that he had a "respiratory disease" and an "infectious disease" under RCW
    51.32.185(1 ), which shifted the burden of proving a nonemployment cause of valley
    fever to the City. As to fact, Gorre alleged that he was exposed to the fungus from
    responding to emergency calls on Interstate 5, where he inhaled spores transported
    by vehicles traveling north from California. 1
    1
    Gorre also argued that he suffered from eosinophilic lung disease, separate from and in
    addition to valley fever. But after hearing medical testimony, the Board found Gorre's only
    diagnosis was valley fever. The Court of Appeals affirmed. Gorre v. City of Tacoma, 
    180 Wash. 4
    Gorre v. City of Tacoma, No. 90620-3
    After hearing extensive motions, an industrial appeals judge (IAJ) ruled that
    even if RCW 51.32.185 applied, the City's initial evidence had rebutted the
    presumption. The IAJ then held an evidentiary hearing where Gorre retained the
    burden of proving an employment-related exposure to valley fever.               Following
    several days of testimony, the IAJ proposed a decision and order finding that valley
    fever was an infectious disease that Gorre likely acquired in Nevada.              Expert
    · testimony supported these findings, and the Board adopted them.              The Board
    affirmed rejection of Gorre's benefits claim. The Pierce County Superior Court
    likewise affirmed after a bench trial.
    The Court of Appeals reversed and remanded for a new evidentiary hearing,
    holding that Gorre was entitled to RCW 51.32.185(1 )'s presumptions for respiratory
    and infectious diseases. Gorre v. City ofTacoma, 
    180 Wash. App. 729
    , 
    324 P.3d 716
    (2014). We granted the City's petition for review. Gorre v. City of Tacoma, 
    181 Wash. 2d 1033
    ,
    343 P.3d 760
    (2015).
    STANDARD OF REVIEW
    A modified standard of review applies to workers' compensation appeals.
    The Board's decision and order is presumed correct, and the party challenging that
    decision carries the burden on appeal to the superior court. RCW 51.52.115. The
    App. 729, 760, 
    324 P.3d 716
    (2014). Since Gorre has not cross petitioned for review of that
    finding, it is not before us.
    5
    Gorre v. City of Tacoma, No. 90620-3
    superior court can make its own findings or reach a different result only if the judge
    finds by a preponderance of the evidence that the Board's findings and decision are
    erroneous. Ravsten v. Dep 't ofLabor &Indus., 
    108 Wash. 2d 143
    , 146, 
    736 P.2d 265
    (1987).
    When reviewing the Board proceedings, we only examine "the record to see
    whether substantial evidence supports the findings made after the superior court's
    de novo review, and whether the court's conclusions oflaw flow from the findings."
    Ruse v. Dep'tofLabor &Indus., 
    138 Wash. 2d 1
    , 5-6,977 P.2d 570 (1999). However,
    statutory interpretation remains a question of law we determine de novo. Cockle v.
    Dep't ofLabor &Indus., 142 Wn.2d 801,807, 
    16 P.3d 583
    (2001).
    ANALYSIS
    A.     INTERPRETATION OF "RESPIRATORY DISEASE"                INRCW 51.32.185(l)(a)
    We first consider if valley fever is a "respiratory disease" under RCW
    51.32.185(1 )(a). This is a question of statutory interpretation,2 so we begin with the
    plain meaning of the term. Dep 't ofEcology v. Campbell & Gwinn, LLC, 
    146 Wash. 2d 1
    , 11, 
    43 P.3d 4
    (2002). Plain meaning is "discerned from the ordinary meaning of
    2
    The briefing somewhat mischaracterizes the issue as whether a certain medical condition
    is a "respiratory disease" is a question of law or fact. What "respiratory disease" means in RCW
    51.32.185(1)(a) is undisputedly a question of law susceptible to judicial review. 
    Cockle, 142 Wash. 2d at 807
    . And whether a firefighter has a "respiratory disease"-whatever its statutory
    meaning-is a fact question reserved for the fact finder. So the real dispute here is how to interpret
    "respiratory disease" in RCW 51.32.185(1 )(a), and specifically if the legislature intended the term
    to carry its ordinary or medically accepted meaning.
    6
    Gorre v. City of Tacoma, No. 90620-3
    the language at issue, the context of the statute in which that provision is found,
    related provisions, and the statutory scheme as a whole." Tingey v. Haisch, 
    159 Wash. 2d 652
    , 657, 
    152 P.3d 1020
    (2007). Our ultimate task, of course, is to ascertain
    and carry out the legislature's intent. Campbell & 
    Gwinn, 146 Wash. 2d at 9
    .
    Because the Act does not define "respiratory disease," the Court of Appeals
    turned to an ordinary dictionary.    The Court of Appeals merged the ordinary
    definitions of "respiration" and "disease" and concluded the plain meaning of
    "respiratory disease" is any "discomfort or condition of an organism or part that
    impairs normal physiological functioning relating, affecting, or used in the physical
    act of breathing." 
    Gorre, 180 Wash. App. at 762-63
    . Dictionaries are an appropriate
    source of plain meaning when the ordinary definition furthers the statute's purpose.
    State v. Veliz, 
    176 Wash. 2d 849
    , 854, 
    298 P.3d 75
    (2013).
    But the ordinary definition of a term is not dispositive of a statute's plain
    meaning when the term is also a term of art. !d. "Respiratory disease" has a unique
    meaning in the medical community, which uses the term to refer to a category of
    specific diagnoses that share certain pathologies. This is different than the broad
    ordinary definition, so we must ascertain the legislature's intent and choose the
    meaning that best furthers the statute's intended purpose. Campbell & 
    Gwinn, 146 Wash. 2d at 9
    . Did the legislature intend to presume that any effect on breathing is an
    occupational disease acquired while firefighting, consistent with the ordinary
    7
    Gorre v. City of Tacoma, No. 90620-3
    definition of respiratory disease? Or did it intend the presumption to apply only to
    specific diseases that doctors diagnose as respiratory diseases? For three reasons,
    we hold that interpreting "respiratory disease" as a term of art better reflects the
    legislature's purpose in enacting RCW 51.32.185(1)(a).
    First, interpreting "respiratory disease" as a specific category of diagnoses
    rather than a broad category of symptoms fits with the mechanics of RCW
    51.32.185(1 )(a). The statute is simply a shortcut for proving medical causation-
    i.e., that job conditions caused an occupational disease. Causation is a specialized
    area where the legislature and the courts have always deferred to expert diagnosis.
    See Dennis v. Dep 't of Labor & Indus., 109 Wn.2d 467,477,
    745 P.2d 1295
    (1987);
    Parr v. Dep 't ofLabor & Indus., 
    46 Wash. 2d 144
    , 145,278 P.2d 666 (1955); Ehman v.
    Dep't of Labor & Indus., 33 Wn.2d 584,600,206 P.2d 787 (1949). Gorre responds
    that the ordinary definition of "respiratory disease" still requires evidence that his
    breathing is impaired. But testimony about symptoms is a step removed from a
    doctor's opinion about the symptoms' underlying cause. We do not believe the
    legislature meant to minimize the significance of medical opinion to claims under
    the Act when it drafted RCW 51.32.185(1)(a).
    Second, the relationship between RCW 51.32.185(1)(a)'s presumption and
    RCW 51.32.185(1 )(b)-( d)'s three presumptions supports interpreting "respiratory
    disease" as a term of art. RCW 51.32.185(1)'s four presumptions vary in scope
    8
    Gorre v. City of Tacoma, No. 90620-3
    depending on the specific injury. For example, the legislature created a presumption
    for all respiratory diseases, but it limited the presumptions for cancers, heart
    conditions, and, as discussed below, infectious diseases. RCW 51.32.185(1)(a)-(d),
    (3), (4). Using the ordinary meaning of "respiratory disease," however, results in
    RCW 51.32.185(1)(a) becoming a "super presumption" that undermines the express
    limits on the ?ther presumptions.
    For example, the legislature omitted lung cancer from the list of cancers
    entitled to RCW 51.32.185(1)(c)'s presumption. RCW 51.32.185(3). Yet under the
    ordinary definition, lung cancer would almost certainly qualify for the respiratory
    disease presumption because it invades an organ critical to breathing. Likewise,
    RCW 51.32. 185(1 )(b) applies only to heart problems experienced shortly after
    certain firefighting activities.    But if a heart problem occurs too late for that
    presumption, it becomes a respiratory disease as long as breathing is also impaired.
    In other words, the Court of Appeals interpretation allows claimants to plead around
    the statutory limits in RCW 51.32.185. We believe the legislature intended RCW
    51.32. 185(1 )(a) to cover only what doctors diagnose as a respiratory disease and not
    what claimants strategically label as one.
    Third, interpreting "respiratory disease" as a term of art is consistent with the
    9
    Gorre v. City of Tacoma, No. 90620-3
    presumption's intended scope. When the legislature enacted RCW 51.32.185(1 )(a), 3
    it justified the presumption by citing an evidentiary link between "respiratory
    diseases," as the term is used in the statute, and firefighters' routine exposure to
    "smoke, fumes, and toxic or chemical substances." LAWS OF 1987, ch. 515, § 1.
    Thus, the legislature necessarily intended RCW 51.32.185(1)(a) to cover respiratory
    diseases caused by exposure to smoke, fumes, and chemicals-hazards pervasive in
    fighting fires.
    Yet smoke, fumes, and chemicals do not cause valley fever. As an expert in
    Gorre's case testified, valley fever results from exposure to a fungus that dies in
    fire's extreme heat. This illustrates the problem with using the ordinary definition
    of ''respiratory disease." Interpreting RCW 51.32.185(1)(a) to include respiratory
    diseases unrelated to smoke and chemical inhalation broadens the scope of
    presumption beyond the legislature's underlying evidentiary justification for it. It
    leads to the presumption covering any impairment to breathing, even if the
    condition-like valley fever-has no established connection to the risks inherent in
    firefighting.
    Unfortunately the dissent adopts an interpretation of"respiratory disease" that
    3
    The respiratory disease presumption was originally codified at former RCW
    51.32~ 185(1 ). LAws OF 1987, ch. 515, § 2. As discussed below, the legislature amended the statute
    in 2002 to add presumptions for cancers, heart problems, and infectious diseases, LAws OF 2002,
    ch. 337, § 2, and the respiratory disease presumption was recodified at RCW 51.32.185(1)(a).
    10
    Gorre v. City of Tacoma, No. 90620-3
    is not consistent with risks connected to fighting fire. Instead, the dissent concludes
    that because firefighting is risky and because valley fever is acquired through
    inhalation, the legislature must have intended the disease to be a "respiratory
    disease" under RCW 52.31.185(1)(a). Dissent at 4-5. While the dissent assures us
    that adopting a layperson's definition preserves the importance of doctors testifying
    about a "disease's causation and its effects," 
    id. at 5,
    interpreting valley fever as a
    respiratory disease undercuts the value of that very testimony in Gorre's case:
    Q.      . .. Dr. Ayars is Valley Fever an infectious disease?
    A.      Yes.
    Q.      Is it an infectious disease that can cause respiratory symptoms?
    A.      Yes.
    Q.      In your professional medical opmwn what are the chances that
    Lieutenant Gorre acquired Valley Fever in Washington State? Can you
    assign a number or percentage?
    A.      Well, right now we have zero to start with. I guess, you could say one
    in a million. The people that could potentially be at risk are people that
    are gardeners .... [A]s far as trying to link it to firefighters, there is
    absolutely no link there.
    Tr. ofBd. Proceedings (June 14, 201 0) at 362-68 (emphasis added). Despite the fact
    that the medical community does not consider valley fever either a respiratory
    disease or a disease common to firefighting, the dissent concludes the legislature
    would have intended the presumption to apply nonetheless. We believe otherwise. 4
    4 The dissent also suggests that, though the layperson's definition of"respiratory disease"
    is an appropriate interpretation here, it "may no longer be helpful" in other cases. Dissent at 4 n.2.
    We agree that the triggering of RCW 51.31.185(1 )(a)'s presumption depends on the facts of each
    case, but those differences go to application of the statute, not its interpretation. This supports
    our view that "respiratory disease" is a term of art to be applied by medical experts.
    11
    Gorre v. City of Tacoma, No. 90620-3
    There is no doubt firefighting is a dangerous profession, a fact the legislature
    recognized by enacting RCW 51.32.185.           But our appreciation for the work
    firefighters do is not a license to discard the ample evidence that the legislature
    nonetheless intended the statute's presumptions to be narrow. For all the above
    reasons, we interpret "respiratory disease" in RCW 51.32.185(1)(a) as a term of art
    to mean only those diseases the medical profession understands to be respiratory
    diseases. In practice, this requires medical expert testimony that a claimant's disease
    is a respiratory disease, not merely testimony that it affects breathing.
    B.    INTERPRETATION OF "INFECTIOUS DISEASES" IN RCW 51.32.185(1 )(d)
    We turn next to the scope of RCW 51.32.185(1)(d)'s presumption for
    "infectious diseases." The issue is whether that general reference to infectious
    disease includes all infectious diseases (including valley fever), or whether the
    presumption is limited by RCW 51.32.185(4):
    The presumption established in subsection ( 1)(d) of this section shall
    be extended to any firefighter who has contracted any of the following
    infectious diseases: Human immunodeficiency virus/acquired
    immunodeficiency syndrome, all strains of hepatitis, meningococcal
    meningitis, or mycobacterium tuberculosis.
    The parties disagree about the effect ofRCW 51.32.185(4). Gorre argues it is merely
    illustrative of possible infectious diseases; the City responds that the list is an
    exclusive definition of"infectious diseases" qualifying under RCW 51.32.185(1 )(d).
    This question turns on what the legislature intended by "extending" the infectious
    12
    Gorre v. City of Tacoma, No. 90620-3
    disease presumption to certain diseases.
    We again start with the statute's plain meaning. If the text has only one
    reasonable meaning, it is unambiguous and we give it that effect. Campbell &
    
    Gwinn, 146 Wash. 2d at 11-12
    . Unlike "respiratory disease," "extend" is not a term of
    art in this context, so a dictionary is an appropriate starting point. Gorre reads
    "extend" to mean "increase the scope, meaning, or application of," as in the diseases
    enumerated in RCW 51.32.185(4) "increase the scope of' the infectious disease
    presumption described in RCW 51.32.185(1 )(d). He bolsters his definition by noting
    different verbs to modify the cancer and infectious disease presumptions in RCW
    51.32.185.     The legislature clearly drafted RCW 51.32.185(3) to restrict RCW
    51.32.185(1)(c)'s cancer presumption, which "shall only apply to" the specific
    cancers it identifies. Gorre argues that RCW 51.32.185(4) is not as unambiguously
    limiting, perhaps indicating a different intended effect. The City responds with a
    competing definition that means "to reach in scope or application," arguing RCW
    51.32.185(4) therefore limits the scope ofRCW 51.32.185(1)(d).
    Even with the benefit of context, however, there is not a single, reasonable
    interpretation of "shall be extended to" that makes RCW 51.32.185(4)
    unambiguous. 5 We must therefore resort to other aids of statutory interpretation to
    5 For  example, Gorre's interpretation is strained. Since the diseases listed in subsection (4)
    are infectious diseases, they would already qualify under RCW 51.32.185(1)(d)'s presumption for
    "infectious diseases." And if RCW 51.32.185(1 )(d) subsumes the diseases listed in RCW
    13
    Gorre v. City of Tacoma, No. 90620-3
    resolve that ambiguity. State v. A.G.S., 
    182 Wash. 2d 273
    , 277-78, 
    340 P.3d 830
    (2014). And one of those aids-legislative history-ends our analysis. It offers
    conclusive evidence that RCW 51.32.185(4) limits, not expands,                            RCW
    51.32.185(1 )(d).
    The legislature added the infectious disease presumption to RCW 51.32.185
    in 2002 after extended negotiations between two primary stakeholders. Firefighters
    lobbied in support, arguing that while they were routinely exposed to contagious
    bodily fluids on the job, it was difficult to prove a specific employment-related
    exposure.     The firefighters' employers, cities and fire commissioners, were
    concerned about the cost of insurance premiums increasing with the number of
    presumptively covered diseases. H.B. REP. ON H.B. 2663, 57th Leg., Reg. Sess.
    (Wash. 2002). The goal was to agree on a bill that "represent[ed] a compromise with
    no opposition." S.B. REP. ON SECOND SUBSTITUTE H.B. 2663, at 2, 57th Leg., Reg.
    Sess. (Wash. 2002).
    The bill's three sequential drafts chronicle those negotiations.                 As first
    introduced, House Bill (HB) 2663 was significantly broader than the presumptions
    ultimately enacted. For example, the presumption for cancers, which was also added
    51.32.185(4), it is hard to read it as increasing the presumption's scope. The scope of RCW
    51.32.185(1 )(d), with or without RCW 51.32.185(4), is still any infectious disease. Likewise, the
    City's interpretation that RCW 51.32.185(1)(d) "reaches" the diseases in RCW 51.32.185(4) does
    not necessarily preclude the presumption from also reaching other diseases.
    14
    Gorre v. City of Tacoma, No. 90620-3
    in 2002, originally covered all cancers affecting a number of organ systems, not just
    the specific cancers in today's statute. Compare H.B. 2663, at 2, 57th Leg., Reg.
    Sess. (Wash. 2002) (applying cancer presumption to "cancers affecting the ...
    lymphatic, digestive, hematological, urinary, skeletal, oral, or reproductive
    systems"), with RCW 51.32.185(3) (limiting cancer presumption to "prostate cancer
    diagnosed prior to age fifty, primary brain cancer, malignant melanoma, leukemia,
    non-Hodgkin's lymphoma, bladder cancer, ureter cancer, colorectal cancer, multiple
    myeloma, testicular cancer, and kidney cancer").             Likewise, HB 2663 did not
    identify any specific infectious diseases. H.B. 2663, 57th Leg., Reg. Sess. (Wash.
    2002). The cities opposed this first draft as too expensive, their representative
    expressing "concern . . . that right now [the presumption's language] is just
    'infectious diseases.'" 6 A legislator who sponsored the bill agreed that "the scope .
    . . need[ ed] to be narrowed." 7
    The bill's second draft clearly       addres~ed   the concern that the infectious
    disease presumption was too inclusive. Substitute HB 2663 limited the presumption
    to four specific diseases by adding a subsection (4):
    (4) For the purposes of this act, "infectious disease" means
    acquired immunodeficiency syndrome, all strains of hepatitis,
    meningococcal meningitis, and mycobacterium tuberculosis.
    6
    Hr'g on H.B. 2663 Before the H. Commerce and Labor Comm., 57th Leg., Reg. Sess.
    (Jan. 28, 2002), at 92 min., 57 sec., audio recording by TVW, Washington State's Public Affairs
    Network, http://www.tvw.org.
    7
    
    Id. at 91
    min., 48 sec.
    15
    Gorre v. City of Tacoma, No. 90620-3
    SUBSTITUTE H.B. 2663, at 2, 57th Leg., Reg. Sess. (Wash. 2002) (emphasis added).
    Representatives for both sides testified they accepted this limitation. Their focus
    then turned to narrowing the cancer presumption, which still broadly covered
    cancers of many body systems. See H.B. REP. ON H.B. 2663, 57th Leg., Reg. Sess.
    (Wash. 2002).
    The bill's final draft, Second Substitute HB 2663, finally narrowed the list of
    cancers. SECOND SUBSTITUTE H.B. 2663, at 3, 57th Leg., Reg. Sess. (Wash. 2002)
    (as passed by legislature). Yet it also modified subsection (4) to its current form:
    The presumption established in subsection (1) (d) of this section shall
    be extended to any fire fighter who has contracted any of the following
    infectious diseases: Human immunodeficiency virus/acquired
    immunodeficiency syndrome, all strains of hepatitis, meningococcal
    meningitis, or mycobacterium tuberculosis.
    !d. (emphasis added). The addition of "shall be extended to" is not explained in the
    written legislative record, which characterizes the change to subsection (4) only as
    a "[t]echnical correction[ ] ... to clarify the references to ... HIV/AIDS." H.B.
    REP. ON H.B. 2663, at 4, 57th Leg., Reg. Sess. (Wash. 2002). The new language
    may have come from a companion senate bill that also "extended" its infectious
    disease presumption to the same diseases. 8 See SUBSTITUTE S.B. 6643, 57th Leg.,
    Reg. Sess. (Wash. 2002).
    8
    Notably, the senate interpreted subsection (4) in its bill as "limit[ing] the types of
    infectious diseases for which a presumption of occupational disease is established." S.B. REP. ON
    SUBSTITUTE S.B. 6643, at 1, 57th Leg., Reg. Sess. (Wash. 2002). The first draft of the senate bill,
    like HB 2663, left infectious diseases undefined. S.B. 6643, 57th Leg., Reg. Sess. (Wash. 2002).
    16
    Gorre v. City of Tacoma, No. 90620-3
    Gorre argues the change to subsection (4)-eventually codified at RCW
    51.32.185(4)-signals that the legislature intended to enlarge the infectious disease
    presumption. But that inference is at odds with the uniform interpretation of those
    involved in drafting the law. See State v. Evans, 
    177 Wash. 2d 186
    , 199, 
    298 P.3d 724
    (2013) (using "probative committee hearings" to derive legislative intent). After the
    house passed Second Substitute HB 2663, the sponsoring representative testified
    before members of the senate to urge its passage in that chamber:
    This bill passed unanimously out of the House ... due to the fact that
    we sat down with the firefighter organizations, with the fire districts,
    and with the cities and worked out a compromise .... [T]he compromise
    on this bill is really in the last section of that bill ... where we basically
    define the cancers ... and also restrict the infectious diseases and hence
    we kind of reduce the cost ofthis. 9
    The stakeholders echoed a restrictive interpretation of subsection (4).                    The
    firefighters' representative testified that negotiations had "very much narrowed the
    scope of this particular bill. ... The cancers have been limited ... [and] the infectious
    diseases are limited to just those four diseases that have been listed in the text of the
    bill." 10   The cities' representative likewise cited subsection (4)'s "narrowed
    definition of infectious diseases" as a reason the cities withdrew their previous
    9
    Hr'g on Second Substitute H.B. 2663 Before the S. Labor, Commerce and Fin. Inst.
    Comm., 57th Leg., Reg. Sess. (Feb. 25, 2002), at 25 min., 55 sec., audio recording by TVW,
    Washington State's Public Affairs Network, http://www.tvw.org (emphasis added).
    10
    Hr'g on Second Substitute H.B. 2663 Before the S. Ways and Means Comm., 57th Leg.,
    Reg. Sess. (Mar. 1, 2002), at 51 min., audio recording by TVW, Washington State's Public Affairs
    Network, http://www.tvw.org (emphasis added).
    17
    Gorre v. City of Tacoma, No. 90620-3
    opposition to the bill. 11 The senate passed Second Substitute HB 2663 without
    amendment, and it wasincorporated into RCW 51.32.185. LAWS OF 2002, ch. 337,
    § 2. The final bill report also treats subsection (4) as a limiting provision. FINAL B.
    REP. ON SECOND SUBSTITUTE H.B. 2663, 57th Leg., Reg. Sess. (Wash. 2002).
    While curious, the change to RCW 51.32.185( 4) does not overcome the
    conclusive history that the provision limits the infectious disease presumption. From
    the outset, the stakeholders and legislators acknowledged the original bill was
    overbroad. Each successive draft addressed that concern, first in Substitute HB 2663
    by enumerating certain infectious diseases, and then in Second Substitute HB 2663
    by narrowing the number of cancers.           This is a clear trend of whittling the
    presumptions, not expanding them. Cf Lewis v. Dep 't ofLicensing, 
    157 Wash. 2d 446
    ,
    4 70, 139 P .3d 1078 (2006) (sequential drafts of a bill can indicate legislative intent).
    Instead of interpreting the statute consistent with this trend, Gorre asks us to infer
    that in the final stages of negotiation, the legislature eschewed compromise and
    revived an expansive infectious disease presumption that it had already outright
    rejected. Nothing in the legislative record supports such an abrupt shift in policy.
    Considering the legislative record as a whole, we hold that RCW 51.32.185(4)
    limits the presumption in RCW 51.32.185(l)(d) to the infectious diseases expressly
    enumerated.
    11
    
    Id. at 52
    min., 35 sec.
    18
    Gorre v. City of Tacoma, No. 90620-3
    CONCLUSION
    RCW 51.32.185 is a narrow exception to the Act's general rule that workers
    must prove they suffer from an occupational disease. Consistent with that intent, we
    interpret "respiratory disease" in RCW 51.32.185(1)(a) to mean those diseases that
    the medical profession understands to be respiratory diseases. We also interpret
    RCW 51.32.185(4) as the exclusive list of "infectious diseases" qualifying under
    RCW 51.32.185(1 )(d). This does not preclude firefighters with impaired breathing
    or other infectious diseases from obtaining workers' compensation benefits; it just
    requires them to prove causation just like any other injured worker.
    We reverse the Court of Appeals and reinstate the superior court's judgmentP
    12
    Substantial evidence supports the superior court's findings and the court's legal
    conclusions flow from those findings. See 
    Ruse, 138 Wash. 2d at 5-6
    . The superior court adopted
    the Board's findings that valley fever was an infectious disease, not a respiratory one, and that
    Gorre's exposure occurred in Nevada. The superior court concluded that Gone failed to show he
    suffered an occupational disease under the Act.
    Substantial evidence exists if a rational trier of fact could find the facts by a preponderance
    of the evidence; unchallenged findings are verities on appeal. In re Welfare of A. W., 
    182 Wash. 2d 689
    , 711, 
    44 P.3d 1186
    (2015) (citing Merriman v. Cokeley, 
    168 Wash. 2d 627
    , 631, 
    230 P.3d 162
    (20 10)). Not only does Gorre fail to challenge valley fever's classification as an infectious disease,
    his briefs rely on it. And the City's medical experts testified on a more probable than not basis
    that Gorre was exposed to the fungus while golf1ng in Las Vegas.
    The superior court's legal conclusion that Gorre's valley fever is not an occupational
    disease flows from those two findings. An occupational disease must "arise[ ] naturally and
    proximately out of employment." RCW 51.08.140. Golf1ng in Nevada is not naturally or
    proximately connected to firefighting in Washington. Reinstatement of the superior court's
    judgment is therefore the appropriate remedy.
    19
    Gorre v. City of Tacoma, No. 90620-3
    WE CONCUR:
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    Gorre v. City of Tacoma
    Dissent by Johnson, J.
    No. 90620-3
    JOHNSON, J. (dissenting)-This case involves the Industrial Insurance
    Act's (IIA) 1 evidentiary exception designed to benefit and protect our state's
    firefighters. In exchange for firefighters' willingness to compromise their own
    health and safety as a part of their occupation, the legislature grants them a
    rebuttable presumption that certain afflictions-respiratory diseases, certain
    cancers, certain heart problems, and infectious diseases-are prima facie
    occupational diseases under RCW 51.08.140. We are obligated to construe this
    remedial exception broadly, in favor of those whose job puts them at higher risk
    for disease and infection. But in applying that statute, the majority finds ambiguity
    where there is none and arrives at an interpretation of the statute that contravenes
    the statute's plain language and legislative intent. For the foregoing reasons, I
    respectfully dissent.
    1
    Title 51 RCW.
    Gorre v. City o.fTacoma, No. 90620-3
    (Johnson, J., dissenting)
    Statutory Interpretation
    The IIA provides certain benefits to employees who suffer from
    occupational diseases. To qualify for benefits, a claimant generally bears the
    burden of establishing causation between the workplace conditions and the disease.
    RCW 51.32.185(1) flips this burden with respect to those diseases firefighters are
    most susceptible to as a class: relevant to this case, we presume that "[r]espiratory
    disease[s]" and "infectious diseases" are caused by the nature of their work. RCW
    51.32.185( 1)(a), (d). As discussed by the majority, the IIA does not provide a
    definition for "respiratory diseases" or "infectious diseases," and it is our
    obligation to interpret those terms in accord with legislative intent. We start that
    analysis with the purpose of the statute at issue.
    The legislature specifically recognized that firefighters as a class suffer a
    higher rate of lung disease than the general public due to their regular exposure to
    not just smoke and fumes but also toxic or chemical substances. LAws OF 1987, ch.
    515, § 1. The legislature conferred this benefit in order to ease the evidentiary
    burden for firefighters, whose employment puts their health and safety at risk.
    Because the IIA "is remedial in nature," we are required to construe it "liberally
    ... in order to achieve its purpose of providing compensation to all covered
    employees injured in their employment, with doubts resolved in favor of the
    2
    Gorre v. City ofTacoma, No. 90620-3
    (Johnson, J., dissenting)
    worker." Dennis v. Dep 't of Labor & Indus., 109 Wn.2d 467,470, 
    745 P.2d 1295
    (1987).
    Through that lens, the Court of Appeals correctly recognized that valley
    fever--a disease that "is transmitted through inhalation" and "'impairs a person's
    respiratory system"--constitutes both a "respiratory disease" and an "infectious
    disease" under the statute. 2 Gorre v. City ofTacoma, 
    180 Wash. App. 729
    , 763, 
    324 P.3d 716
    (2014), review granted, 
    181 Wash. 2d 1033
    , 
    343 P.3d 760
    (2015). I agree
    with the Court of Appeals that valley fever constitutes both types of diseases and
    that both exceptions qualify Gorre for the rebuttable presumption.
    Respiratory Disease
    It is well settled that when a term is not defined by statute, the court may
    look to the dictionary to give the undefined term meaning. Ultimately, the court
    will adopt the interpretation that best advances the legislative purpose, but so long
    as the dictionary provides a definition consistent with legislative intent, it is an
    (.).ppropriate source for interpretative guidance. LaCoursiere v. Camwest Dev., Inc.,
    
    181 Wash. 2d 734
    , 742, 
    339 P.3d 963
    (2014).
    2
    These statutory terms do not purport to be mutually exclusive, and this court should
    refrain from reading a nonexistent limitation into what should have been a broad reading of the
    statutory exception.
    3
    Gorre v. City ofTacqrna, No. 90620-3
    (Johnsori, J., dissenting)    ·
    Here, the Court of Appeals looked to the dictionary, which defines (1)
    '"respiratory' as 'of or relating to respiration,"' wherein "respiration" means the
    "'single, complete act of breathing,"' and (2) "'disease' as a 'cause of discomfort
    or harm,' or 'an impairment of the normal state of the living animal or plant body
    or any of its components that interrupts or modifies the part of the vital functions.'"
    ,   
    Gorre, 180 Wash. App. at 762
    (footnote omitted) (quoting WEBSTER'S THIRD NEW
    INTERNATIONAL DICTIONARY            1934, 648 (2002)). Thus, "respiratory disease" is a
    condition of the respiratory system that causes discomfort or harm, impairing the
    normal physiological functioning relating to, affecting, or used in the physical act
    of breathing.
    The dictionary definition reflects a common, layperson's understanding of
    "respiratory disease," and here it serves as an appropriate guide for interpretation.
    Where the legislative intent is to afford an exception to firefighters in recognition
    that they expose their lungs to all sorts of chemicals and substances, it follows that
    the legislature would intend to include those diseases, like valley fever, that are
    contracted through inhalation, infect the lungs, and cause serious damage to the
    respiratory system. 3
    ---------------
    3Vve address only the cases before us, but to the extent the dictionary definition could be
    applied to different facts in a manner that is incongruous with legislative intent, the dictionary
    definition may no longer be helpful. Here, the dictionary definition aptly serves as an
    4
    Gorre v. City o.fTacoma, No. 90620-3
    (Johnson, J., dissenting)
    The majority adopts a much narrower definition, reasoning in part that the
    exception serves as a shortcut to proving causation, which typically requires a
    plaintiff to present extensive medical expert testimony. Therefore, the legislature
    .   .      .
    must have fntended that "respiratory disease" consists of only those diseases that
    fall within the technical, medical definition.
    The rnajority's analysis diminishes the larger purpose of the statute by
    focusing instead on its ancillary features. As discussed by the majority, the
    importance of expert medical testimony can certainly be inferred from the statute
    and legislative history; but the primary goal of the statute is to provide an
    evidentiary shortcut for certain diseases in recognition that airborne contaminants
    are a comm~m cause of ~isease among firefighters. The majority's definition of
    "respiratory disease" could potentially exclude a whole host of other diseases, like
    valley fever, that are caused by inhaling contaminated air, but may be
    characterized by the medical community in a way that the legislature could not
    have predicted. This is why it is the role of medical experts to testify as to the
    medical aspects of the disease-such as the disease's causation and its effects-but
    it is within the proper ambit of the court to determine whether the legislature likely
    interpretative guiding tool for determining whether valley fever constitutes "respiratory disease"
    under the statute. ·
    5
    Gorre v. City ofTacoma, No. 90620-3
    (Johnson, J., dissenting)
    intended the exception to apply. Here, expert medical testimony established that
    valley fever is caused by the inhalation of toxic spores into the lungs, which causes
    serious respiratory and pulmonary symptoms. The         me~ical   community may
    categorize the disease differently, but a broader, ordinary interpretation of the term
    confirn1s· our commitment to reading remedial statutes broadly and better reflects
    .169 Wash. 2d 815
    ,
    820,239 P.3d 354 (2010).
    The ordinary meaning ofRCW 51.32.185(1)(d) is that the evidentiary
    exception applies to "infectious diseases." Subsection (4), by its ordinary meaning,
    ·~   >lt'equires that the term "infectious diseases" extend to four enumerated diseases. As
    recognized by the Court of Appeals, the phrase "shall be extended to" evinces the
    clear legislative intent to ensure the inclusion of four specific types of infectious
    diseases. Nothing within this subsection should be read to limit the coverage of
    infectious diseases generally.
    Instead of ~pplying the statute's plain meaning, the majority delves into
    legislativ~   history_, insisting that.the statute is ambiguous because subsection (4)
    coul.d be read as creating an exclusive list. But the majority manufactures this
    ambiguity. The language of this subsection does not contain any limiting phrases,
    nor by its terms does the subsection even suggest a limitation of the exception to
    the enumerated list. Subsection (4) purports to do nothing more than ensure
    coverage for four specified types of infectious diseases. The majority disagrees,
    reasoning
    .
    that when the. legislature said "shall extend to," it might have actually
    '                 .
    meant "shall only extend to." But this interpretation of the statute requires an
    7
    Gorre v. City o.fTacoma, No. 90620-3
    (Jbhnson, J., dissenting)
    infere.nce that the legislature omitted the word "only" out of either sloppiness or
    mistake.
    I disagree that such ambiguity exists. The legislature is perfectly proficient
    at drawing statutes carefully and will include limiting language when it intends to
    create a limitation. In fact, the legislature demonstrated its ability to do so in the
    dwo subsections immediately preceding subsection (4):
    (2) The presumptions established in subsection (1) of this
    section shall be extended to an applicable member following
    termination of service for a period of three calendar months for each
    year of requisite service, but may not extend more than sixty months
    following the last date of employment.
    (3) The presumption established in subsection ( 1)(c) of this
    section[, cancer,] shall onjy_ apply to any active or former firefighter
    tvho has cancer that develops or manifests itself after the firefighter
    has served at least ten years .... The presumption within subsection
    (I)( c) of this section shall9nly apply to prostate cancer diagnosed
    prior to the age of fifty, primary brain cancer, malignant melanoma,
    · leukemia, non.:.Hodgkin's lymphoma, bladder cancer, ureter cancer,
    colorectal cancer, multiple myeloma, testicular cancer, and kidney
    cancer.
    RCW 51.32.185 (emphasis added).
    It is unlikely that the legislature, having expressly limited the exception's
    scope in both subsections (2) and (3), suddenly forgot how to do so when drafting
    subsection (4 ). It is also an unreasonable interpretation of the statute to assume this
    to be the·case. The language ofthese preceding subsections is the strongest
    8
    GQrre v. City.ofTacoma, No. 90620--3
    (Johnson; J., dissenting)
    conceivable evidence that the legislature knows how to create an exclusive list
    when it wants to but that it chose not to do so with respect to infectious diseases. It
    is inappropriate to delve into legislative history when the meaning of this provision
    is plain on its face. To replace the plain meaning of the statute with our own
    derived interpretation is to deprive the legislature of its own chosen words and
    :iCarefully selected omissions and, in essence, rewrites the statutory language.
    I would hold that the statute plainly covers infectious diseases and provides
    only an additional assurance that certain diseases fall within the statutory definition
    of "infectious disease." If the legislature intends to limit the scope of the exception
    with respect to infectious diseases, it is within its proper authority to revise the
    statute as h sees fit. But it is not the role of the court to read in language not
    present in the statute. Because it is undisputed that valley fever constitutes an
    "infectious disease," it is covered by the statute and Gorre should have been
    9
    Gorre v. City ofTacoma, No. 90620-3
    (Johnsori, J., dissenting)
    entitled to the presumption in his favor. I respectfully dissent.
    10