What privilege does a public entity have to refuse to disclose the identity of an informant?

Generally, "a public entity has a privilege to refuse to disclose the identity of a person who has furnished information purporting to expose a violation of a law and to prevent another from disclosing such identity if disclosure is against the public interest because there is a necessity for preserving the confidentiality of the informant's identity

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that outweighs the necessity for disclosure in the interest of justice." (People v. Ruiz (1992) 9 Cal.App.4th 1485, 1488.)