557 - Members; certain disabilities.

§  557.  Members; certain disabilities.  Notwithstanding any provision  of this chapter or of any general, special or local law to the contrary,  any condition of impairment of health caused by diseases of  the  heart,  resulting  in  disability  or  death  to  a  member shall be presumptive  evidence that it was incurred in the performance and discharge  of  duty  and the natural and proximate result of an accident, unless the contrary  be proved by competent evidence.