§ 607-l. Performance of duty disability retirement; division of homeland security and emergency services. a. Any employee of the division of homeland security and emergency services in the title series fire protection specialist who becomes physically or mentally incapacitated for the performance of duty as the natural and proximate result of an injury sustained in the performance or discharge of his or her duties shall be paid a performance of duty disability retirement allowance equal to that which is provided in section sixty-three-b of this chapter.

b. Notwithstanding any provision of this chapter or of any general or special law to the contrary, any condition of impairment of health caused by diseases of the heart resulting in disability or death to an employee covered by this section presently employed who shall have sustained such disability while so employed and who successfully passed a physical examination on entry into service, which examination failed to disclose evidence of any disease or other impairment of the heart, shall be presumptive evidence that such disease or impairment was incurred in the performance and discharge of duty, unless the contrary be proved by competent evidence.