What is a workplace investigation?

A workplace investigation is a fair, documented process for finding out what happened after a complaint or incident, such as harassment, theft or a safety violation, so the employer can act on facts.

In shortA workplace investigation gathers and weighs evidence about an allegation of misconduct or a policy violation. It usually involves interviewing the person who raised the concern, the person accused and witnesses, reviewing records, reaching a conclusion and deciding on action. A good investigation is prompt, impartial and written down. It also protects the people involved: under Title VII (42 USC 2000e-3(a)), it is unlawful to discriminate against an employee because they opposed an unlawful practice, made a charge, or testified, assisted or participated in an investigation, proceeding or hearing.

The steps

  1. Take the complaint seriously and record it, even if it is informal.
  2. Decide on interim steps, such as schedule changes that do not penalize the person who complained.
  3. Choose an investigator who is impartial and has no reporting line to either person.
  4. Interview the person who complained, the person accused and witnesses, separately.
  5. Collect records: messages, schedules, time records, camera footage where used.
  6. Weigh the evidence and decide what more likely than not happened.
  7. Act, document the outcome, and tell both parties what they need to know.
  8. Follow up to check that there is no retaliation.
From complaint to follow-upRecordcomplaintInterviewand collectWeighevidenceAct andfollow upCheck for retaliation at 2 weeks and 2 months
Each step is written down, from the first report to the last follow-up.

Worked example: the records settle the timeline

A complaint at a hotel

A housekeeper reports that a maintenance worker made sexual comments to her in a stairwell on a Saturday evening. He denies it and says he was not working that weekend.

The HR manager interviews both and two coworkers, one of whom heard part of the exchange. She then checks the time records: the maintenance worker clocked in at 2:58 p.m. that Saturday on the property’s kiosk and out at 11:04 p.m., after a shift swap he had requested. His statement that he was not there was false.

The finding is that the comments more likely than not happened. He receives a final written warning and is moved to a different shift; the housekeeper’s schedule does not change. HR checks in with her at 2 weeks and 2 months. The time records did not prove what was said, but they decided whose account of the day was accurate.

Mistakes that are specific to workplace investigations

Writing the investigation report

A short, structured report is enough for most workplace investigations. It should include the allegation as reported, the dates and people interviewed, the documents and records reviewed, a summary of each account, the investigator’s findings on each point with the reason, and the action taken. Keep opinion out of the summaries and put reasoning in the findings.

Write each finding as what more likely than not happened and why, for example because a witness account and the time records agree. Store the report and notes in a confidential investigation file, not in the personnel file of everyone involved, and share only what each person needs to know about the outcome.

Second example: a complaint that is not substantiated

A cashier reports that a shift lead gives her the worst register and the shortest breaks because she complained about him before. The investigator reviews 8 weeks of register assignments and break records and interviews 5 coworkers.

Register assignments rotate on a written chart, and her breaks match the team’s average. The finding is not substantiated. The investigator tells both parties, reminds the shift lead about the rule against retaliation, and schedules a check-in with the cashier at 4 weeks. The records allowed a clear answer instead of a standoff.

Pull the time records earlyIn any investigation that turns on who was where, pull clock-in records, schedules and shift swaps before the interviews. Knowing the timeline first helps you ask the right questions and spot statements that do not fit.

Questions people ask

How long should a workplace investigation take?

As long as it needs to be thorough, but start promptly. Simple cases often take days, complex ones a few weeks.

Who should conduct a workplace investigation?

Someone impartial with no reporting relationship to either person. An outside investigator helps when the accused is senior or the issue is serious.

Can the person who complained be protected from retaliation?

Yes. Title VII makes it unlawful to discriminate against employees for opposing unlawful practices or taking part in an investigation, and other laws have similar protections.

What standard of proof is used?

Most workplace investigations decide what more likely than not happened.

Should the accused employee be suspended during an investigation?

Sometimes, for serious allegations, often as paid leave. Choose interim steps that do not penalize the person who complained.

Do witnesses have to keep the investigation confidential?

You can ask for discretion to protect the process, but be careful with blanket rules that stop employees from discussing working conditions. Get advice on how to word the request.

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Disclaimer: This explanation of workplace investigation is general information, not legal, payroll or tax advice; rules differ by state and city and change over time, and the examples are fictional.