The test of necessity for suppression of information about police investigative methods requires identification of a substantial detriment to the administration of justice that would be significantly alleviated by suppression. Where the methods would necessarily be disclosed in prosecutions where they are successfully applied, and where they have already received substantial publicity, suppression will not meet the necessity threshold. Confidential affidavits filed in support of suppression applications may be sealed even where the suppression order itself is refused.
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