This bill amends RCW 51.32.185 to create and expand prima facie, but rebuttable, presumptions that certain medical conditions are occupational diseases under RCW 51.08.140 for specified firefighters, public fire investigators, and certain law enforcement officers. The presumptions cover respiratory disease, heart problems, a listed set of cancers, specified infectious diseases (HIV/AIDS, all strains of hepatitis, meningococcal meningitis, and mycobacterium tuberculosis), and posttraumatic stress disorder (PTSD). The presumption can be rebutted by a preponderance of the evidence, examples of rebuttal evidence are listed, and a presumption period may extend after termination of service by three calendar months per year of service up to a 60‑month maximum. The cancer presumption is limited to active or former firefighters and fire investigators with at least 10 years of service and who meet qualifying medical‑exam conditions at hire; the bill names a specific list of cancers covered and sets different procedural rules tied to hire dates and whether an employer provided the qualifying exam. The PTSD presumption is limited to cases in which PTSD develops or manifests after at least 10 years of service and also applies if an employer did not provide the psychological exam required by RCW 51.08.142. When a determination involving these presumptions is appealed and the final decision allows the claim, the board of industrial insurance appeals or a court must order the opposing party to pay all reasonable appeal costs, including attorney and witness fees; in state fund cases those costs paid by the department are charged to the claim and paid from the accident fund. The bill requires creation of an advisory committee on occupational disease presumptions to review scientific evidence and make legislative recommendations, specifies committee composition and conflict‑of‑interest limits, and requires the department’s safety and health assessment and research for prevention program to provide support. It also names the act the "Erik Shouse memorial act." The extract does not identify the specific department responsible for certain rulemaking and support duties, does not include unchanged portions of the amended statute, and does not fully show prior text or the final status of deleted language (for example, changes involving the term "firefighting activities"), so some contextual details and exact prior wording are unclear from the provided material.

If enacted, covered firefighters, fire investigators, and certain law enforcement officers will find it easier to qualify for workers’ compensation for a long list of diseases (including many cancers, specified infectious diseases, heart and respiratory conditions, and PTSD) because those conditions will be presumed work-related unless an employer proves otherwise. That will likely increase successful claims and could raise costs for employers, insurers, and the state accident fund (appeal-winning claimants get their appeal costs paid and in state fund cases those costs are charged to the claim), while employers who fail to give required prehire medical or psychological exams may lose a defense and face more claim liability; the law also extends the time after separation in which claims are presumed work-related by three months per year of service up to five years. The people most affected are full-time paid firefighters (including large private department staffs), public fire investigators, and the listed law enforcement officers, who will have stronger paths to benefits after 10 or more years of service for certain conditions and PTSD; employers and the state may face higher benefit and legal costs and might need to provide or document qualifying exams. The bill creates a scientific advisory committee to review evidence and advise the legislature, which could change covered conditions later; however, the text does not name the specific department that must do some rulemaking or show the unchanged parts of the existing statute, and some deletions (for example around the phrase “firefighting activities”) leave precise scope unclear.