The following excerpt is from Mills v. City of Covina, 921 F.3d 1161 (9th Cir. 2019):
State law also governs the application of collateral estoppel to a state court judgment in a federal civil rights action. Ayers v. City of Richmond , 895 F.2d 1267, 1270 (9th Cir. 1990). Under California law, collateral estoppel bars the relitigation of an issue in a subsequent proceeding when certain threshold requirements are fulfilled:
Gikas v. Zolin , 6 Cal. 4th 841, 849, 25 Cal.Rptr.2d 500, 863 P.2d 745 (1993).
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