Section 1: Chapter 41 of the General Laws, as so appearing in the 2014 Official Edition, is hereby amended by adding the following new section:-

Section 34: Any employee of a municipal police department who, preceding the date of disablement, had not been previously diagnosed with a mental impairment, is diagnosed with a mental impairment then the mental impairment is presumptively an occupational disease and shall be presumed to have been due to the nature of the employment. This presumption may be rebutted by substantial factors brought by the employer or insurer. Any substantial factors that are used to rebut this presumption and that are known to the employer or insurer at the time of the denial of liability shall be communicated to the employee on the denial of liability. The mental impairment is not considered an occupational disease if it results from disciplinary action, work evaluation, job transfer, layoff, demotion, promotion, termination, retirement, or similar action taken in good faith by the employer.