Under California Evidence Code Section 912, a confidential privilege is waived when the person who holds it voluntarily discloses, or consents to someone else disclosing, a significant part of the protected communication. That is the whole rule in one sentence. The work is in what counts as “voluntary,” what counts as “significant,” and which disclosures the statute expressly protects from waiver.
Which Privileges Section 912 Governs
Section 912 is not a general waiver rule. It applies to ten specific privileges: lawyer-client (Section 954), lawyer referral service-client (Section 966), confidential marital communications (Section 980), physician-patient (Section 994), psychotherapist-patient (Section 1014), penitent (Section 1033), clergy member (Section 1034), sexual assault counselor-victim (Section 1035.8), domestic violence counselor-victim (Section 1037.5), and human trafficking caseworker-victim (Section 1038). Communications inside these relationships are presumed to have been made in confidence, and the party attacking the privilege carries the burden of proving otherwise.1California Legislative Information. California Evidence Code 917
Only the Holder Can Waive
Waiver is the holder’s decision alone. For attorney-client privilege, the holder is the client, not the lawyer. Under Evidence Code Section 953, the client is the holder if they have no guardian or conservator; if they do, that person becomes the holder unless there’s a conflict of interest. When a client dies, the holder role passes to the personal representative of the estate.2California Legislative Information. California Evidence Code 953
An attorney can and must claim the privilege on the client’s behalf, but the attorney cannot waive it over the client’s objection. The duty to assert the privilege continues unless there is no holder or the holder tells the attorney otherwise.3California Legislative Information. California Code EVID 954
What Counts as Waiver Under Section 912(a)
Two things trigger waiver: the holder voluntarily discloses a significant part of the communication, or the holder consents to someone else disclosing it.4California Legislative Information. California Code EVID 912
“Significant part” is what does most of the sorting. A passing or tangential reference to a privileged conversation may not destroy the privilege; testifying about the substance of what a lawyer advised, or turning over documents containing privileged communications in discovery without objection, clearly does. Whether a particular disclosure crosses the line is a fact-specific call for the court.
The policy driving the rule is fairness. A party cannot selectively reveal the helpful parts of a confidential communication and then invoke privilege to hide the rest. Open the door and the other side can walk through it.
Consent, Silence, and the Advice-of-Counsel Trap
Consent to disclosure can be spoken or implied by conduct, including failure to object when the opportunity arises. If opposing counsel questions your lawyer at a deposition about the details of a privileged conversation and you sit through it without raising a privilege objection, that silence functions as consent.4California Legislative Information. California Code EVID 912
The most litigated flavor of implied waiver is the advice-of-counsel defense. When a party argues they acted in good faith because their lawyer said the conduct was lawful, they’ve put the substance of a privileged communication squarely at issue. Courts read that as a deliberate choice to place the attorney’s advice into the case, and the opposing side gets to test that advice by exploring the underlying communications.5Media Law Resource Center. Use of Advice of Counsel as a Defense by Reporters You can’t wield the advice as a shield and then claim privilege to block scrutiny of it.
Disclosures That Do Not Waive the Privilege
Section 912 protects several categories of disclosure from triggering waiver.
Coerced Disclosure
The statute requires the disclosure to be “without coercion.” If a court overrules your privilege claim and orders you to produce documents or testify, that compelled disclosure does not waive the privilege in later proceedings. The voluntary element is missing.4California Legislative Information. California Code EVID 912
Disclosures Reasonably Necessary to the Professional’s Work
When an attorney, physician, psychotherapist, or other covered professional needs to share confidential information to accomplish the purpose you hired them for, the disclosure does not waive the privilege as long as it stays confidential. A lawyer sharing case facts with a retained expert is the classic example. This exception does not extend to the marital communications privilege or to the penitent and clergy member privileges.4California Legislative Information. California Code EVID 912
Disclosures That Are Themselves Privileged
Sharing a communication with someone who is covered by a separate privilege doesn’t waive anything. Joint holders of an attorney-client privilege can discuss the communication between themselves without losing it.4California Legislative Information. California Code EVID 912
Joint Holders Act Independently
When more than one person holds a privilege, one holder’s waiver does not affect the other’s right to claim it. This rule runs through all the listed privileges, and the statute specifically preserves one spouse’s right to invoke the marital communications privilege even if the other has waived.4California Legislative Information. California Code EVID 912
Inadvertent Disclosure and Clawback
Section 912 does not mention accidental disclosure. Its text talks about disclosure made “without coercion” and about “consent,” both of which suggest a voluntary, intentional act. California courts have read that language to mean an unintentional disclosure does not automatically waive the privilege. In Rico v. Mitsubishi Motors, the California Supreme Court held that inadvertent disclosure did not waive the privilege and required that an attorney who receives materials obviously appearing to be privileged must stop reading them and notify the sender immediately.6Stanford Law School. Rico v. Mitsubishi Motors
The California Law Revision Commission has observed that this protection would be clearer if Section 912 itself said waiver requires a voluntary and intentional act. It doesn’t yet. Protection against accidental waiver still rests on case law rather than statutory text.7California Law Revision Commission. Waiver of Privilege By Disclosure
For electronic documents produced in discovery, there is a formal clawback mechanism. California Code of Civil Procedure Section 2031.285 lets a party who accidentally produced privileged electronic materials notify the recipient, who must then stop using the material, sequester it, and either return it or lodge it with the court under seal. The receiving party has 30 days to challenge the privilege claim by motion, and the material stays out of use until the court rules.8California Legislative Information. California Code of Civil Procedure 2031.285
How Far a Waiver Reaches
When waiver does happen, it generally reaches only the specific communication (or significant part of it) that was actually disclosed. Section 912 says the privilege “is waived with respect to a communication protected by the privilege,” and California courts read that as tying the waiver to the disclosed communication rather than sweeping in every other conversation the client and professional ever had.4California Legislative Information. California Code EVID 912
This is narrower than the “subject matter waiver” concept in federal practice, where an intentional disclosure can extend to undisclosed communications on the same subject when fairness demands it under Federal Rule of Evidence 502(a).9Legal Information Institute (Cornell Law School). Federal Rule of Evidence 502 – Attorney-Client Privilege and Work Product; Limitations on Waiver California courts may still order production of closely related communications when basic fairness requires it, but that isn’t the statutory default. The starting point under Section 912 is that one disclosure does not drag other communications down with it.
Waiver Does Not Mean the Communication Comes In at Trial
Losing a privilege removes the confidentiality barrier. It does not clear the communication for admission into evidence. A waived communication still has to satisfy every other rule of evidence before a jury hears it. Hearsay, relevance, and prejudice objections all remain available. Waiver opens the door to compelled disclosure during discovery and testimony; whether the material ultimately reaches the factfinder is a separate question governed by the rest of the Evidence Code.