A medical examiner or district attorney may investigate an injury whenever the injury occurred under suspicious or unknown circumstances. All authority granted to the medical examiner or district attorney by ORS § 146.003 to 146.189 and 146.710 to 146.992 may be exercised in making such investigation. [1963 c.621 § 2; 1965 c.221 § 18; 1967 c.545 2,3; 1971 c.401 § 7; 1971 c.451 § 10; 1973 c.408 § 26; 2007 c.294 § 2]