Wash. Rev. Code § 72.23.130
It shall be the duty of the superintendent to ascertain by diligent inquiry and correspondence, the history of each and every patient admitted to his or her hospital.
[ 2012 c 117 s 466; 1959 c 28 s 72.23.130. Prior: 1951 c 139 s 40. Formerly RCW 71.02.530.]