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When a workplace complaint arrives, the first decision a California employer must make is not what happened. It is who will find out. The choice between an internal and an external workplace investigation shapes the credibility, defensibility, and legal standing of everything that follows. In my overview of workplace investigations in California, I explain that the California Fair Employment and Housing Act requires investigations to be prompt, thorough, and impartial. Whether internal or external, the process must meet that standard. The decision depends on who can realistically deliver it.
An internal investigation is appropriate when the matter is limited in scope, the complainant and respondent are peers with no supervisory relationship, the assigned HR professional has no prior involvement with either party, and the organization is large enough to maintain genuine separation between investigator and subject. The California Civil Rights Department’s 2025 Harassment Prevention Guide identifies impartiality as a core component of what constitutes reasonable steps by the employer. If that standard can be met internally, external support may not be necessary.
An independent investigator becomes necessary when the respondent holds authority over the assigned HR professional, when the complaint involves an executive or senior leader, when multiple complaints suggest a systemic pattern, or when a prior investigation has been challenged for bias. The Association of Workplace Investigators identifies neutrality and objectivity as foundational standards for any credible investigative process. For harassment and discrimination matters, the credibility of the investigator is inseparable from the credibility of the findings.
California law is specific on this point. An external workplace investigator must be either a licensed California private investigator or an attorney acting in their legal capacity. Under California Business and Professions Code §7520 et seq., administered by the Bureau of Security and Investigative Services, it is unlawful for an unlicensed individual to conduct investigative services for hire. An HR consultant or unlicensed third party vendor retained as an external investigator does not meet this standard. An investigation conducted by an unlicensed person can be invalidated in grievance proceedings, civil litigation, and administrative appeals.
If your organization is facing a workplace investigation matter, contact Allen Morris Investigations for a confidential consultation at 949-573-4624 or allenmorrispi.com.
When an organization assigns an internal investigator to a matter that required independence, the resulting report becomes vulnerable to challenge on bias grounds. When it retains an unlicensed external investigator, the investigation may be invalidated entirely. Both outcomes compromise the organization’s legal position under California Government Code §12940(k) and can result in significant financial exposure. The cost of the right decision at the outset is substantially lower than defending a flawed process in litigation.
Not if they are engaged as an external contractor for hire. California Business and Professions Code §7520 requires external investigators to be licensed private investigators or attorneys acting in their legal capacity. An unlicensed consultant retained for that purpose does not meet the legal standard and the resulting investigation may be challenged or invalidated.
No. Retaining an independent investigator reflects the complexity and risk level of the matter, not a judgment about the HR team’s competence. In high stakes matters, independence protects both the organization and the integrity of the investigative process. Many experienced HR professionals recognize this distinction and recommend outside investigators when the circumstances warrant it.
Impartiality, proper licensing, structured methodology, and documented findings. California courts assess how conclusions were reached, not only what those conclusions were. A licensed independent investigator produces a record that is substantially more difficult to challenge in litigation or administrative proceedings.
The decision between an internal and an external workplace investigation is not a matter of preference. It is a matter of legal obligation, organizational risk, and the integrity of the process itself. For a full overview of what California employers are required to do when a complaint arises, see my guide to workplace investigations in California. If you are unsure which approach your situation requires, that question deserves a careful answer before the investigation begins.
Legal Disclaimer: This article is provided for general informational purposes only and does not constitute legal advice. The information contained herein is not a substitute for consultation with a qualified California employment attorney. Laws and legal standards may change, and the application of the law depends on the specific facts of each situation.
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Kathie Allen is a licensed California Private Investigator (PI 27033) with over 20 years of experience conducting workplace investigations throughout Orange County and California. She is an Association of Workplace Investigators (AWI) trained investigator and Certified Title IX Investigator specializing in harassment, discrimination, employee misconduct, and Title IX compliance investigations for businesses, schools, and organizations.
Phone: 949-573-4624
Email: Kathie@allenmorrispi.com
Website: https://allenmorrispi.com
Schedule a consultation or learn more at Allen Morris Investigations LLC.
