Notwithstanding the provisions of any general or special law to the contrary, any condition of impairment of health caused by hypertension, heart disease, or respiratory disease resulting in total or partial disability to an officer or member of a fire department who successfully passed physical examination on entering into such service, which examination failed to reveal any evidence of such condition, shall be presumed to have been suffered in line of duty, unless the contrary be shown by competent evidence.

Source: SL 1957, ch 248, § 3; SDC Supp 1960, § 45.1212.