Section 363-F. Firefighters; presumption in certain diseases

Notwithstanding any provision of this chapter or of any general, special
  or local law to the contrary, and for the purposes of this chapter,  any
  condition  of  impairment  of  health  caused  by  diseases of the lung,
  resulting in total or partial disability or death to a uniformed  member
  of  a  paid  fire  department,  where  such member successfully passed a
  physical examination on entry into such service or  subsequent  thereto,
  which  examination  failed  to  reveal  any evidence of such conditions,
  shall be presumptive evidence that such  disability  or  death  (1)  was
  caused by the natural and proximate result of an accident, not caused by
  such   firefighter's   own  negligence  and  (2)  was  incurred  in  the
  performance and discharge of duty, unless  the  contrary  be  proven  by
  competent  evidence. The provisions of this section shall remain in full
  force and effect to  and  including  the  thirtieth  day  of  June,  two
  thousand eight.
    * NB Expired July 1, 2008