Is Your Investigation File Defensible? A 12-Point Review

Why the file matters more than the finding

When a complaint turns into a charge or a lawsuit, the investigation becomes evidence. A careful process can support the company's defense even if the finding is disputed. A careless one can become the plaintiff's best exhibit. In December 2025, a federal jury awarded $11.5 million against the Society for Human Resource Management in a race discrimination and retaliation case. Coverage of the trial focused on an internal investigator who had never conducted a discrimination investigation before. The lesson applies to every employer: who investigates, and how, is part of the case.

The 12-point review

• 1. Investigator neutrality. No reporting relationship to the parties, no stake in the outcome, and no prior involvement in the dispute.
• 2. Investigator competence. Training and experience that fit the seriousness of the allegations. Senior leaders and owners usually call for an outside investigator.
• 3. Timeliness. Intake, interim measures, interviews, and closure within a reasonable period, with any delays explained.
• 4. Scope. Every allegation in the complaint identified and addressed, including any retaliation concern raised along the way.
• 5. Interim measures. Steps to protect the complainant during the investigation that did not penalize the complainant.
• 6. Witness coverage. The complainant, the respondent, and witnesses each side identified, or a documented reason for not interviewing someone.
• 7. Documentary evidence. Emails, messages, schedules, and records collected and preserved, not just described.
• 8. Interview documentation. Contemporaneous notes or summaries, dated, that record questions as well as answers.
• 9. Credibility analysis. Explained reasoning for whom the investigator believed and why: corroboration, consistency, plausibility, and motive.
• 10. Standard and conclusion. A stated standard, usually preponderance of the evidence, and findings on each allegation that follow from the evidence.
• 11. Remediation. Corrective action proportionate to the findings and consistent with how similar conduct was handled before.
• 12. Closure and retaliation safeguards. Both parties told the outcome at an appropriate level of detail, a retaliation reminder given, a follow-up check scheduled, and the file retained.

The patterns that fail most often

• The investigator reported to the person accused, or to someone who already decided the outcome.
• Only the complainant and respondent were interviewed.
• The report states a conclusion without explaining why one account was credited over another.
• The complainant's schedule, role, or reviews changed soon after the complaint.
• Discipline did not match what the company did in similar past cases.

When to review a file

Review before discipline or termination is finalized, when a charge or demand letter arrives, and periodically across a sample of closed files. A periodic review finds process gaps while they are still lessons rather than exhibits. See handling a complaint without HR and the first 90 days after an EEOC charge.