"could potentially make him more susceptible to middle ear injuries" but that the "pre-existing
middle ear issues could also cause fluctuating hearing loss unrelated to the incident." She
ultimately concluded that the ongoing hearing loss was "more likely related to pre-existing
middle ear issues" than the workplace trauma — despite the absence of any fluctuating loss
prior to the incident.

The Clinical Flaw — and the Direct Parallel to the Holand File: This case establishes the
clearest pattern. The Advisor pathologized a successfully resolved childhood surgery,
performed over two decades before the workplace incident, to avoid holding the employer
accountable for a documented, acute physical injury. The pre-existing medical history was
selectively weaponized as a scapegoat while the documented mechanism of injury — the
physical insertion of the mould — was minimized. This is the exact template applied in the
Holand file. In both cases, a managed, non-occupational medical history was deployed to
shift blame from the workplace engineering failure onto the worker's biology.

Precedent Cases C and D: The Fire Captain and the Retired Firefighter
(WCAT A2001793 and A2100322)

Two career firefighters — a fire captain with 35 years of service and a retired firefighter with
37’4 years — presented with documented sensorineural hearing loss directly attributed to
occupational noise exposure. Firefighters are classified as trained field observers whose
operational testimony carries high administrative credibility. Their duties expose them to air
horns, diesel apparatus, pneumatic extrication tools, and emergency sirens — acoustic
hazards that are mathematically undeniable.

The Pang Methodology Applied: In A2100322, the Advisor issued a flat denial, arguing
that the configuration of the worker's hearing loss was "not at all consistent with the known
characteristics of hazardous occupational noise-induced hearing loss" — citing bilateral
asymmetry as positive evidence of a non-occupational cause. She also averaged the
worker's daily exposure across the entire work year, mathematically erasing the intense
transient acoustic events that define firefighting. In A2001793, the Advisor increased the
estimated noise exposure for fire captains to 83 dBA — still below the 85 dBA policy
threshold — despite direct employer testimony that the captain's duties and acoustic
exposure were identical to those of frontline firefighters. The averages trap erased the
operational reality.

The Clinical Flaw: A fire captain does not exist in a balanced laboratory. They operate with
fixed, highly specific physical orientations to severe, localized acoustic loads — an open left
window directly adjacent to an electronic siren, an apparatus pump panel with an unshielded
engine exhaust block, air horns mounted feet from the cab. Denying a claim because a
chaotic, directional emergency response environment failed to produce perfectly symmetrical
laboratory results directly contradicts the basic principles of wave propagation and spatial
acoustics. In A2001793, WCAT Vice Chair Elaine Murray gave greater weight to the direct
testimony of the fire captain and his battalion chief, finding that the noise exposure data used
by the Advisor was drawn from fire departments with different command structures — and
that the Advisor's revised NER did not reflect the worker's actual operational reality. The
WCAT found the worker was exposed to hazardous noise beyond 2009 — directly
contradicting the Advisor's foundational assumption.