(1) Except as provided in subsection (2) of this section, the department shall adopt a rule pursuant to chapter 34.05 RCW that claims based on mental conditions or mental disabilities caused by stress do not fall within the definition of occupational disease in RCW 51.08.140.

(2)(a) Except as provided in (b) and (c) of this subsection, the rule adopted under subsection (1) of this section shall not apply to occupational disease claims resulting from posttraumatic stress disorders of firefighters as defined in RCW 41.26.030(17) (a), (b), (c), and (h) and firefighters, including supervisors, employed on a full-time, fully compensated basis as a firefighter of a private sector employer's fire department that includes over fifty such firefighters, and law enforcement officers as defined in RCW 41.26.030(19) (b), (c), and (e), and public safety telecommunicators who receive calls for assistance and dispatch emergency services.

(b) For firefighters as defined in RCW 41.26.030(17) (a), (b), (c), and (h) and firefighters, including supervisors, employed on a full-time, fully compensated basis as a firefighter of a private sector employer's fire department that includes over fifty such firefighters, and law enforcement officers as defined in RCW 41.26.030(19) (b), (c), and (e) hired after June 7, 2018, and public safety telecommunicators hired after June 11, 2020, (a) of this subsection only applies if the firefighter or law enforcement officer or public safety telecommunicators, as a condition of employment, has submitted to a psychological examination administered by a psychiatrist licensed in the state of Washington under chapter 18.71 RCW or a psychologist licensed in the state of Washington under chapter 18.83 RCW that ruled out the presence of posttraumatic stress disorder from preemployment exposures. If the employer does not provide the psychological examination, (a) of this subsection applies.

(c) Posttraumatic stress disorder for purposes of this subsection (2) is not considered an occupational disease if the disorder is directly attributed to disciplinary action, work evaluation, job transfer, layoff, demotion, termination, or similar action taken in good faith by an employer.

(d) "Public safety telecommunicators" means individuals who receive and respond to telephone or other electronic requests for emergency assistance, such as law enforcement, fire, and medical services, and dispatch appropriate emergency responders.