Except to the extent the confidentiality of material is protected by law or its disclosure is prohibited by law, a public entity shall permit the claimant to inspect all files and records bearing upon his claim or the prosecution of the claimant's grievance. If a claimant is improperly denied access to any relevant material bearing on the claim, such material may not be relied upon in reviewing the initial determination.
Cal. Code Regs. Tit. 25, § 6166