Less often than employers expect. An investigation run by a lawyer to give the company legal advice can be protected by the attorney-client privilege and the work product doctrine. An investigation run by HR or a nonlawyer investigator usually isn’t. And even a privileged investigation loses its protection if the employer later defends a harassment or discrimination case by pointing to how thorough the investigation was. California courts don’t let an employer use the report as a shield and keep it hidden at the same time.
What makes an investigation privileged in the first place?
The communication has to be between client and lawyer, made in confidence, to get legal advice. Evidence Code section 954 gives the client “a privilege to refuse to disclose, and to prevent another from disclosing, a confidential communication between client and lawyer.”
The leading employment case is Wellpoint Health Networks, Inc. v. Superior Court (1997). An employee complained of race discrimination, the company hired an outside lawyer to investigate, and the employee later sued and demanded the investigation file. The court explained that when a company is the client, “the dominant purpose must be for transmittal to an attorney ‘in the course of professional employment.’”
That test looks at function, not job title. A lawyer hired to find facts and report them as a neutral, the same way an HR investigator would, may not be giving legal advice at all. A lawyer hired to assess the company’s legal exposure and recommend a response is. Engagement letters and the list of people who received the report become evidence on that question. A lawyer who reports only to HR, with no in-house or outside counsel involved, looks more like a fact-finder than an advisor.
Work product is a second layer, and it belongs to the attorney’s own thinking more than to the facts. Under Code of Civil Procedure section 2018.030, a writing “that reflects an attorney’s impressions, conclusions, opinions, or legal research or theories is not discoverable under any circumstances.” Other attorney work product is protected unless denying discovery “will unfairly prejudice the party seeking discovery” or “will result in an injustice.”
Does an employee’s right to the personnel file override the privilege?
No. In Wellpoint, the employee argued the investigation file belonged in his personnel file under Labor Code section 1198.5 and had to be produced. The court refused: “We refuse to read into the Labor Code an implied exception to the attorney-client privilege or work product doctrine.”
That holding protects material that really is privileged. It doesn’t turn ordinary HR notes into privileged documents. A witness summary written by an HR manager for the HR file is likely to be produced in discovery whether or not the employee asks for the personnel file first. The firm’s post on personnel file and payroll records requests covers what those requests reach.
How does an employer waive the privilege over an investigation?
By relying on the investigation to defend the case. This is the part of Wellpoint that changes strategy. The court agreed that “the employer’s injection into the lawsuit of an issue concerning the adequacy of the investigation where the investigation was undertaken by an attorney or law firm must result in waiver of the attorney-client privilege and work product doctrine.”
It then put the rule in terms every defense team remembers: “If a defendant employer hopes to prevail by showing that it investigated an employee’s complaint and took action appropriate to the findings of the investigation, then it will have put the adequacy of the investigation directly at issue, and cannot stand on the attorney-client privilege or work product doctrine to preclude a thorough examination of its adequacy. The defendant cannot have it both ways.”
Timing matters. The court held that waiver couldn’t be decided until the pleadings showed what defense the employer would raise, noting that an employer “might instead choose to defend by denying the alleged incidents occurred or by denying they were racially motivated.” Under Wellpoint, waiver depends on whether the answer or discovery responses indicate “a defense based on thorough investigation and appropriate corrective response.”
That puts the decision in the employer’s hands, with real tradeoffs. In a harassment case, the employer’s prompt investigation and corrective action are often the heart of the avoidable-consequences defense and the response to a failure-to-prevent claim. Giving that up to protect the report is rarely the right call. The better practice is to plan for disclosure from the start.
| Investigation set-up | Likely privilege status | What happens if the employer relies on it |
|---|---|---|
| HR investigator, report to HR | Not privileged | Produced in discovery either way |
| Outside nonlawyer investigator retained directly by the company | Usually not privileged | Produced in discovery either way |
| Outside lawyer acting as neutral fact-finder | Disputed; depends on the engagement | Waived as to the investigation if raised as a defense |
| Counsel giving legal advice on exposure, separate from the fact-finder | Advice generally privileged | Fact-finding file waived if relied on, while separate advice may stay protected |
Should a company use two lawyers, one to investigate and one to advise?
For a serious complaint, that structure is common and often sensible. The investigator, lawyer or not, finds the facts and writes a report the company expects to produce if it defends on the investigation. Separate counsel advises the company on discipline and litigation risk. If the employer later relies on the investigation, the waiver reaches the investigation, and the separate advice has a better chance of staying protected.
The two-track approach only works if the lines hold. An investigator who also recommends discipline and assesses liability blurs the roles. So do emails that mix fact-finding and advice on the same thread. A report that will be produced should be written as if a jury will read it, because one may: neutral, specific about what each witness said, and clear about how credibility was assessed. The firm’s guide to running a harassment investigation covers that part of the process.
What to lock down when a complaint turns into a claim
- Preserve the investigation file under a litigation hold: the complaint, interview notes and recordings, the report, drafts, the emails and texts of everyone involved, and the policies that applied.
- Calendar the deadline on the CRD complaint, EEOC charge, or summons, and check the EPLI policy’s notice and counsel-selection terms before choosing who will defend.
- List the investigator, the decision-makers, and every witness, and don’t change the complaining employee’s job or pay without counsel reviewing it first.
- Gather the engagement letter for any lawyer or investigator, and sort the file into fact-finding material and legal advice.
- Decide with counsel, before the answer is filed, whether the defense will rely on the investigation, because that choice may decide what gets produced.
The firm’s page on employer defense in California employment cases describes its work on harassment and discrimination claims.
Investigation privilege questions
Are interview notes taken by HR privileged?
Usually not. Notes taken by HR for HR’s own purposes are business records. Even if a lawyer later reviews them, sending a document to counsel doesn’t make it privileged after the fact. If the company wants a protected channel, counsel has to direct the work from the start, and the notes have to be made for legal advice, not routine personnel management.
Does labeling a report “privileged and confidential” protect it?
A label helps show intent, but it doesn’t decide the question. Courts look at who prepared the document, for whom, and why. A report labeled privileged that reads like a neutral HR finding, circulated to managers who aren’t involved in legal decisions, invites a ruling that it was never privileged. Limiting distribution to the people who need legal advice is just as important as the label.
If we waive the privilege, does everything the lawyer ever wrote get produced?
Not necessarily, and the answer often depends on how the files were kept. Wellpoint tied waiver to the adequacy of the investigation the employer put at issue. A separate lawyer’s advice on settlement strategy or litigation risk isn’t automatically swept in. The scope of a waiver is argued case by case, which is why keeping the investigation and the legal advice in separate files is worth the effort.
Can an employee get the report before filing a lawsuit?
A former employee’s request for the personnel file doesn’t reach privileged material, under Wellpoint. Non-privileged parts of an investigation may still be subject to personnel file or records requests, and they’ll almost certainly be requested in discovery once a lawsuit is filed. Employers should assume a non-privileged report will eventually be read by the employee’s lawyer.
If an employee’s lawyer is asking for your investigation file
If your company is facing a harassment, discrimination, or retaliation claim after an internal investigation, how that investigation was structured may decide what the other side gets to read. Rosenberger + Kawabata represents employers defending employment lawsuits and claims through its business litigation practice, including claims involving workplace investigations. Contact Rosenberger + Kawabata online for a confidential consultation, or call (310) 894-6921.
Sources
The statutes are Evidence Code section 954 and Code of Civil Procedure section 2018.030. The case is Wellpoint Health Networks, Inc. v. Superior Court (1997) 59 Cal.App.4th 110.
This post is general information about California and federal employment law as of November 7, 2026. It is not legal advice, and reading it does not create an attorney-client relationship. Employment statutes, regulations, and court decisions change often, and the outcome of any claim depends on its facts. Past results do not guarantee future outcomes.