GENERAL LEGAL PRINCIPLES; COLLATERAL ESTOPPEL; RES JUDICATA – In General

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Collateral estoppel precludes the relitigation of an issue already decided in another proceeding where: “(1) the issue is identical to that decided in the former proceeding, (2) the issue was actually litigated in the former proceeding, (3) the issue was necessarily decided in the former proceeding, (4) the decision in the former proceeding is final and on the merits, and (5) preclusion is sought against a person who was a party or in privity with a party to the former proceeding.” (Castillo v. City of Los Angeles (2001) 92 Cal.App.4th 477, 481; see also City and County of San Francisco (2022) PERB Order No. Ad-497-M, p. 27.)