Pub. Rec. and Meetings/Mental Health and Substance Abuse; Specifies that hearings relating to mental health & substance abuse, respectively, are confidential & closed to public; provides exceptions; exempts certain information from public records requirements; expands public records exemption to include certain petitions & applications; authorizes disclosure of certain confidential & exempt documents to certain service providers; authorizes courts to use respondent's name for certain purposes; revises applicability; provides for future legislative review & repeal of exemption; making technical changes; provides statements of public necessity.