Confidential affidavits and submissions filed in support of public interest immunity claims must be treated with the same level of protection as the subject material where their disclosure would destroy or significantly impair the confidentiality interest, including through a 'jigsaw' effect when combined with other available information. The proper process requires the court to inspect confidential documents itself before deciding whether disclosure to opposing parties' legal representatives is necessary. The appointment of an amicus curiae may be the most practical alternative where a contradictor is needed.
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