Except as provided in Sections 7924.510, 7924.700, and 7929.610, this division does not require disclosure of any preliminary drafts, notes, or interagency or intraagency memoranda that are not retained by a public agency in the ordinary course of business, if the public interest in withholding those records clearly outweighs the public interest in disclosure.
Ca. Gov. Code § 7927.500