Va. Code § 27-40.1
The death of, or any condition or impairment of health of salaried or volunteer fire fighters caused by respiratory diseases, hypertension or heart disease resulting in total or partial disability shall be presumed to have been suffered in the line of duty unless the contrary be shown by a preponderance of competent evidence; provided that prior to making any claim based upon such presumption for retirement, sickness or other benefits on account of such death or total or partial disability, such salaried or volunteer fire fighters shall have been found free from respiratory diseases, hypertension or heart disease, as the case may be, by a physical examination which shall include such appropriate laboratory and other diagnostic studies as such governing body shall prescribe and which shall have been conducted by physicians whose qualifications shall have been prescribed by such governing body; and provided, further, that any such fire fighter or, in the case of his death, any person entitled to make a claim for such benefits, claiming that his death or disability was suffered in the line of duty shall, if requested by such governing body or its authorized representative, submit himself, in the case of claim for disability benefits, to physical examination by any physician designated by such governing body, which examination may include such tests or studies as may reasonably be prescribed by the physician so designated or, in the case of a claim for death benefits, submit the body of the deceased fire fighter to a postmortem examination to be performed by the medical examiner for the county, city or town appointed under § 32.1-282. Such fire fighter or claimant shall have the right to have present at such examination, at his own expense, any qualified physician he may designate.
Va. Code § 27-40.1