PRACTICE AND PROCEDURE - Summons for production - Legal professional privilege - Application of Evidence Act 1995 - Waiver of privilege - Whether privilege abrogated by provisions of Police Act 1990 - Principles - Legal professional privilege as a substantive right - Documents privileged - Section s 117, s 118, s 119, s 131A, s 133 Evidence Act 1995, s 181D, s 181E, s 181G Police Act 1990