When a Hunch Isn't Enough: A Disciplined Approach to Credibility Determinations

Every workplace investigation eventually comes down to the same hard question: who do you believe? Two employees give conflicting accounts of the same meeting, the same comment, the same night out after work. There's rarely a video recording. There's rarely a signed confession. What there is, almost always, is a set of clues about which version of events is more likely true — and a professional investigator's job is to weigh those clues systematically rather than go with a gut feeling.

Why "I Believe Her" Isn't a Finding

A credibility determination that boils down to instinct is a credibility determination that falls apart under scrutiny — whether that's in front of the California Civil Rights Department, opposing counsel, or a jury. The Association of Workplace Investigators (AWI), the leading professional body for this work, has developed a widely used framework of credibility factors that trained investigators apply to every witness, every time, regardless of how a claim strikes them personally.

The Factors, in Practice

Corroboration matters first. Does anything outside the witness's own account back up what they're saying — a text message, an email, a calendar entry, another witness who heard about it independently at the time? Corroboration doesn't have to be a smoking gun; even a witness mentioning the incident to a coworker the same afternoon adds weight.

Opportunity to observe comes next. A witness can only credibly describe what they were actually positioned to see or hear. Hearing about an incident secondhand is a very different kind of evidence than witnessing it directly.

Consistency gets tested over time, not just within a single interview. People's memories shift, and a witness contradicting a minor detail from one telling to the next isn't necessarily lying — but a witness contradicting themselves on the central facts of a complaint is a different matter.

Investigators also weigh a witness's relevant history, whether the account is plausible given how the organization actually operates day to day, whether the witness has an incentive to shade their story one way or the other, and whether they have a documented reputation for accuracy — as opposed to a supervisor's vague impression of them.

One factor experienced investigators are trained to be skeptical of is demeanor. AWI's own guidance cautions against reading too much into how a witness carries themselves in an interview — nervousness, poor eye contact, or a flat affect can just as easily reflect anxiety, cultural background, or an off day as it can reflect dishonesty. Basing a finding heavily on how someone "seemed" is exactly the kind of subjective shortcut a disciplined framework is designed to prevent.

Why This Matters to Your Business

None of this is academic. A poorly reasoned credibility finding is one of the first things a plaintiff's attorney will attack if a disciplinary decision is later challenged — and a well-reasoned one is often what stands between a defensible employment decision and a costly claim. When an investigation report shows its work, walking through the specific factors weighed and why one account was found more credible than another, it gives the organization a record it can stand behind.

If your business is facing a complaint that calls for a formal, defensible investigation, that structure isn't optional — it's the difference between a finding that holds up and one that doesn't.

This post is provided for general informational purposes only and does not constitute legal advice. Reading it does not create an attorney-client relationship. For advice about your specific situation, please contact our office directly.