The Board shall ascertain by examination and inquiry whether the laws relating to individuals in custody or control are properly observed and may use all necessary means to collect all desired information. It shall carefully inspect every part of the hospital or training school visited with reference to its cleanliness and sanitary condition, determine the number of patients or students in seclusion or restraint, the diet of the patients or students, and any other matters which it considers material. It shall offer to every patient or student an opportunity for an interview with its visiting members or agents, and shall investigate those cases which in its judgment require special investigation, and particularly shall ascertain whether any individuals are retained at any hospital or training school who ought to be discharged. (Added 1967, No. 305 (Adj. Sess.), § 1, eff. Oct. 1, 1968.)