A workplace misconduct investigation is a formal, defensible inquiry into allegations of harassment, discrimination, retaliation, theft, fraud, policy violation, or other employee behavior that may expose the employer to legal, financial, or reputational risk. A professional investigation produces a documented timeline, interview-based findings, supporting evidence, and a written report that holds up under EEOC scrutiny, arbitration, or litigation. After 30 years of running investigations alongside HR and in-house legal teams across the country, the single most consistent pattern we see is this: the cases that go badly for the employer are almost never the cases the employer thought were going to be hard.

Why workplace misconduct cases are getting harder to handle internally

Three forces are converging in 2026 that make purely internal investigations more risky than they were a decade ago.

First, the volume is up. The U.S. Equal Employment Opportunity Commission received 81,055 new charges of discrimination in fiscal year 2023, and harassment charges alone reached 31,354 - a 47% increase over the prior three years (EEOC, 2024). The likelihood that any midsize employer faces a charge in a given year has been rising steadily.

Second, the standard of evidence required has tightened. Plaintiffs’ counsel and the EEOC both routinely scrutinize the process of an investigation - who interviewed whom, what was preserved, how findings were documented - separately from the substance. An investigation that reaches the right conclusion through a process that does not look defensible on paper still creates exposure.

Third, the workplace itself is more complex. Hybrid and remote work scatters communications across Slack, Teams, email, text, and personal devices. Most internal HR teams lack the digital-evidence-preservation discipline to capture all of those sources cleanly the first time, which is the only time an investigation gets to capture them.

When to hire an external investigator

Bringing in a licensed external investigator is the right call in five common scenarios:

•           The accused is a senior executive, board member, or HR leader. Internal investigations into senior leaders are rarely perceived as independent by the complainant or by a jury, regardless of how rigorous they actually are.

•           The case involves potential criminal exposure — theft, fraud, embezzlement, drug-related conduct, threats of violence, or contact with law enforcement.

•           The complainant or accused has counsel, or there is reasonable likelihood the matter will end in litigation.

•           The matter spans multiple jurisdictions or remote workforces where digital evidence and cross-state legal nuance complicate internal effort.

•           The internal HR team is conflicted, under-resourced, or has prior involvement with either party that could later be characterized as bias.

What a professional investigation actually does

The scope is narrower than most managers expect, and that’s the point. A workplace misconduct investigation is not a fact-finding mission to determine whether someone is “a good person.” It is a structured inquiry to determine, on a preponderance-of-the-evidence standard, whether a specific allegation is substantiated, partially substantiated, or unsubstantiated.

The professional process generally includes:

1.         Scoping conversation with HR/legal to define the allegation, the universe of policies potentially violated, the relevant time window, and the deliverable format.

2.         Evidence preservation - securing email, chat platforms, security camera footage, badge data, and relevant device data before anything is overwritten or auto-deleted.

3.         Interview plan - complainant, accused, named witnesses, and any additional witnesses identified in those interviews. Each interview is documented and, where appropriate, recorded with consent.

4.         Documentary review - HR file, performance documentation, prior complaints, calendar and travel records, expense data, and policy/handbook history.

5.         Written report - a structured findings document with allegations, evidence considered, credibility analysis, applicable policies, and a substantiation determination per allegation.

6.         Coordination with legal counsel to preserve attorney-client privilege and work-product protections where appropriate.

How long does a workplace misconduct investigation take?

A focused single-allegation investigation with a manageable witness list typically resolves in 2 to 4 weeks. Complex cases - multiple complainants, multi-jurisdictional witnesses, digital evidence at scale, or active litigation - can run 6 to 12 weeks or longer. Speed should never come at the cost of process integrity; a fast investigation with thin documentation is one of the most expensive mistakes an employer can make.

What an HR or legal leader should bring to the first call

To get a real estimate and a defensible plan from any external investigator, bring the following to the initial scoping call:

•           A redacted summary of the allegation as it was reported.

•           The relevant policy excerpts (handbook, code of conduct, anti-harassment, anti-retaliation).

•           A list of likely witnesses and their reporting relationships.

•           The systems where relevant communications are likely to live (email, Slack, Teams, Zoom recordings, ticketing systems).

•           A clear answer on whether the matter is being handled under attorney-client privilege.

Frequently Asked Questions

What is the difference between an HR investigation and a private-investigator investigation? HR investigations are usually conducted by employees of the company itself. Licensed private investigators bring independence, formal evidence-handling discipline, interview methodology trained against legal standards, and a deliverable structured to be useful to outside counsel. The two are complementary, not interchangeable.

Can investigation findings be used in court? Often, yes - and that is exactly why the process must be defensible. Reports and contemporaneous notes can be subpoenaed in litigation. A licensed investigator’s documentation, properly preserved, generally holds up well as evidence.

Should the accused be told an investigation is happening? Eventually, yes - typically when the investigator interviews them. Premature disclosure risks evidence tampering or witness coordination; over-secrecy creates due-process and retaliation-claim risks. The timing is a judgment call best made jointly between the investigator, HR, and counsel.

Can you conduct interviews of remote employees? Yes. NBI conducts both in-person and video-recorded interviews of remote witnesses across the country. Interview integrity depends more on preparation, neutrality, and documentation than on the medium.

Does NBI handle cases that may turn criminal? Yes. We are experienced in conducting investigations that may run alongside or transition into law-enforcement matters, with careful coordination of evidence handling so that a future prosecution is not compromised.

Is the investigation report privileged? It depends on how the engagement is structured. When the investigation is conducted at the direction of attorneys for the purpose of providing legal advice, the report and notes are generally protected by attorney-client privilege and work-product doctrine. We routinely structure engagements with that protection in place when counsel requires it.

Bring NBI in before the case becomes a lawsuit

If you are managing an active complaint that involves a senior leader, criminal exposure, multi-jurisdictional witnesses, or imminent litigation risk, the right time to engage an external investigator is now. Contact National Business Investigations to scope a defensible workplace misconduct investigation with a written report your legal team can rely on.

About the Author

Michael D. Julian is the founder and principal of National Business Investigations (NBI). He has more than 30 years of investigative experience, including workplace misconduct, fraud, due diligence, asset search, surveillance, and litigation support investigations. He served as President of the California Association of Licensed Investigators (CALI) from 2005 to 2015 and has worked extensively with corporate HR, in-house legal, and outside counsel teams across the United States. Connect on LinkedIn.