p0534 The common interest or joint defense doctrine creates an exception to the rule that voluntary disclosure to a third person waives the attorney - client or attorney work product privilege if the communications involved would have been protected by one of those privileges and if disclosure to the third person was reasonably necessary and made with a reasonable expectation of confidentiality; although in camera review is inappropriate when a claim of absolute privilege is made, it may be conducted to determine whether the privilege was waived by disclosure to a third party.

OXY RESOURCES v SUPERIOR COURT (Joint Defense) 115 Cal.App.4th 874 [See: EvC 912, 952, 915; CCP 2018; Raytheon v Superior Court 208 CA3 683; STI Outdoor v Superior Court 91 Cal.App.4th 334, P/AT 9/01; Wells Fargo v Superior Court 22 C4 201, T/AT 2/00; Smith v Superior Court 41 Cal.App.4th 1014, T/AT 2/96; Wellpoint v Superior Court 59 Cal.App.4th 110, T/AT 12/97]