When should an employer appoint an external workplace investigator?

“Should we get someone external in?” is usually asked too early. It concerns who investigates, and arises only once an employer decides the matter needs factual findings. Plenty of concerns do not. A rostering grievance, a one-off rudeness complaint, a misunderstanding between two people who both want it sorted — these are better resolved by a conversation or facilitated discussion than by a formal investigation.

Sequence matters. Screen the concern first, using our guide to early triage of workplace complaints, then choose a pathway and design the process, covered in managing workplace complaints through a fair process. Only where the pathway is a fact-finding investigation does the internal-or-external question become live.

Two propositions are worth stating up front. External appointment is not inherently better; it suits some matters and is unnecessary for others. Nor does it move the employer's legal obligations onto a contractor.

The strongest reasons to look outside are structural rather than reputational. Ask whether the person you have in mind has a real conflict, or one a reasonable observer with the facts would perceive. Have they already been involved — taking the report, coaching a participant, approving the decision now under scrutiny? Are they a likely witness, or have they expressed a concluded view? Do they report to either party, or to someone with a stake in the outcome? Can they realistically require a senior respondent to attend an interview and answer questions?

That last point disqualifies more internal candidates than any other. Authority is practical as much as formal: a capable, trained and impartial people-and-culture manager may still be unable to interview a director who signs off on their remuneration.

Do not over-apply this. A participant preferring an outsider does not by itself establish a conflict; the test is whether the concern is actual or objectively reasonable on the known facts. Treating discomfort alone as disqualifying outsources straightforward matters and signals that your managers cannot be trusted to act fairly.

Seriousness and sensitivity are factors, not switches. No generally applicable Australian rule requires external appointment merely because an allegation is serious, contested, involves sexual harassment or may cause psychological harm. Serious allegations raise the cost of error, sharpening every other question: is this person trained, do they have time, will their findings withstand scrutiny?

Governance is where the analysis bites. Where the subject is an executive, a director, the head of HR, in-house legal, a safety lead or the person who ordinarily owns the complaint process, the usual internal arrangement may be compromised: that person cannot examine their own conduct, and their direct reports are poorly placed to do it. The employer must then identify an authorised and impartial alternative. External appointment is strongly indicated where no internal person has sufficient authority and separation, but it is not automatic — a board committee, the chair, an independent director or another suitably separated office-holder may be able to appoint or oversee the process. Small employers face the same problem with a smaller bench, where the answer is often a non-executive director or a provider engaged for the single matter.

The Australian Human Rights Commission's material on the positive duty under the Sex Discrimination Act is a useful reference where sexual harassment is in issue. It expects processes that are accessible, trustworthy and responsive — a reason to take the appointment question seriously, not to outsource it.

Some matters are beyond an internal team's reach. Multiple respondents across entities, allegations spanning years, a large digital evidence set, conduct in more than one State or overseas, or a parallel police, regulator or workers' compensation process — each adds method and risk generalist internal investigators rarely handle. Where personal devices, encrypted messaging or forensic recovery are involved, specialist help is often the only responsible option.

Capability is not only technical. It includes interviewing distressed or reluctant participants, awareness of trauma responses, cultural competence and working with an interpreter where needed. Safe Work Australia's guidance on psychosocial hazards is a reminder that the investigation is itself a work process capable of causing harm.

Capacity is most often glossed over. An investigator with a full operational role and no protected time runs late, cuts corners on notes and loses the thread between interviews. If nobody can be released, that alone is a sound reason to look outside.

There is also a credibility dimension. Where an earlier attempt went badly, participants have lost faith in the internal function, or the matter may reach the Fair Work Commission, a court, a regulator or the media, the believability of the process becomes part of its value. An outcome that is sound but widely disbelieved solves little, and the prospect of later external scrutiny — the Commission publishes information about the pathways that may follow workplace sexual harassment — adds to the value of a credible process.

Weigh that against real costs. External investigations take longer to mobilise, cost more, require handover and can feel escalatory to people who wanted a modest response, while someone who already knows the agreement and the site may reach a reliable answer faster. None of that overrides a genuine conflict, but it legitimately decides finely balanced matters.

A distribution centre supervisor is alleged to have twice sworn at a warehouse worker during shift handover and afterwards given him the least desirable tasks. Two colleagues saw the exchanges. No physical conduct is alleged and no discrimination ground raised, and both remain at work on different shifts. The regional HR business partner has no prior involvement or formed view, does not report to the supervisor, is trained in investigations and can be released for a fortnight. This is properly internal: bounded, evidenced by a few interviews and a roster extract, and no better for going outside.

Change the facts. The respondent is the site general manager. The complaint alleges sustained sexual harassment of two employees, one of whom has left, and says an earlier complaint about the same person went to HR eighteen months ago and was never actioned. Some conduct is said to have occurred at an off-site conference and in messaging apps. Here the internal function is part of what needs examining, the respondent outranks anyone who could investigate, the evidence is partly digital and off-premises, and the earlier handling puts internal credibility in question. External appointment is justified, and the appointment decision belongs to the board rather than the HR function whose conduct is in scope.

The choice is not binary, and hybrid arrangements often give the best result for the cost. Three patterns work well. The first keeps an internal case owner — responsible for welfare, communications, interim measures and the decision — while an external investigator finds the facts. The second engages an external specialist to supervise or quality-review an internal investigator, which suits developing capability or one technical element such as digital evidence. The third splits the matter: internal for discrete allegations, external for those involving senior personnel.

Whatever model is chosen, write down who does what. Hybrid arrangements fail when responsibility for fairness, welfare or communications is assumed by everyone and owned by nobody, so allocate each in writing.

Where the internal option is right, a few safeguards do most of the work. Run and record a conflict check covering prior involvement, reporting lines and expressed views. Issue written terms of reference, even briefly — an internal investigator needs the same clarity of mandate as an external one. Separate the fact-finder from the decision-maker where reasonably practicable; in a small organisation that may not be achievable, in which case record why and take extra care that the respondent's answers are genuinely considered.

Add supervision. A more experienced second person reviewing the allegation letters, interview plan and draft findings catches the errors that later prove fatal: allegations too vague to answer, adverse material never put, findings outrunning the evidence. Make clear the investigator can seek specialist legal, safety or cultural advice.

Select on demonstrated investigation skill and familiarity with Australian workplace context, not title or letterhead. A senior lawyer with no interviewing practice is not automatically better than an experienced non-legal investigator, and the reverse holds too. Ask what matters they have run, how they frame allegations and put adverse material, and what their reports look like in practice.

Then test practical fit. Do they know the instrument and jurisdiction — the applicable award or agreement, the relevant State or Territory work health and safety and discrimination regimes, and any public-sector requirements? Can they handle the evidence, including digital material, without contaminating it? Are they available on the timeframe needed? Can they accommodate accessibility needs, interpreters or cultural support? On personal information, identify which privacy regime actually applies: the Australian Privacy Principles do not apply identically to every employer or every investigation, the Privacy Act's employee-records exemption may be relevant, and State, Territory and public-sector regimes can change the position. The OAIC's Australian Privacy Principles guidelines remain a useful reference.

Be precise about independence. An external investigator is retained and paid by the employer, and suggesting otherwise misleads. What they offer is impartiality: no stake in the outcome, no reporting relationship to the parties, and an obligation to follow the evidence. Say that plainly, because participants who feel oversold will distrust the findings.

Participants may raise concerns about the person appointed, and those should be heard and answered — a genuine conflict is better known before the first interview. But neither party ordinarily has a right to choose or veto the investigator, unless an enterprise agreement, policy, contract or agreed process gives them one.

A lawyer is not required for most workplace investigations. Legal input earns its place where allegations have complex statutory dimensions, litigation is realistically in prospect, or findings feed into a contested dismissal. Otherwise an experienced investigator with strong interviewing and analysis skills is often the better appointment.

Privilege is widely misunderstood. Engaging a lawyer does not make an investigation, its notes or its report privileged, and neither does labelling documents privileged or routing them through legal. Privilege depends on the dominant purpose for which a communication or document was created — broadly, obtaining or giving legal advice, or use in existing or anticipated litigation. That purpose is assessed objectively from the evidence and circumstances, not from how the parties describe it. An operational or fact-finding purpose may defeat a claim where it is dominant, while some investigations structured from the outset around legal advice or anticipated litigation can meet the test. If privilege matters, structure it early with advice rather than asserting it later, and expect any claim to be tested.

Overclaiming has costs: it looks like concealment, limits what the employer can say when explaining an outcome, and a failed claim leaves the material exposed. Relying on parts of a report while withholding the rest raises waiver risk. Keep the roles distinct: someone finds the facts, someone advises on the law, the employer decides.

The engagement document does more for quality than the identity of the investigator. It should identify who is appointing and to whom the investigator reports, state the allegations and the questions to be determined, and say what is out of scope as clearly as what is in. Name the policies and instruments that apply and the period examined, and set out the investigator's authority to obtain documents and interview witnesses.

Record how procedural fairness will be delivered: allegations and the substance of any adverse material put to the respondent with sufficient particulars to allow a considered answer, and a genuine chance to give one before findings are made. Deal with support persons by reference to what actually applies — policy, an enterprise agreement, a contract or an agreed process — not a universal statutory entitlement. Under the Fair Work Act the relevant consideration in unfair dismissal cases is whether the employer unreasonably refused a support person in discussions relating to dismissal, which is narrower than a right to attend every interview.

State the standard of proof: findings are made on the balance of probabilities. Where an allegation is serious and the consequences grave, Briginshaw calls for care before reaching reasonable satisfaction. It is not a third standard and does not lift the civil standard toward the criminal one; terms of reference describing a “higher standard” invite error.

Provide for what always arises: what happens if new allegations emerge or scope changes, and who authorises it; deliverables and format; whether the investigator makes findings only, with recommendations if expressly requested; and that no disciplinary decision is made by the investigator unless specifically authorised, which is rarely appropriate. Address confidentiality honestly — participants can be asked not to discuss the matter unnecessarily, but absolute secrecy cannot be promised given fairness, safety duties and the need to act. Cover privacy and data handling, recording of interviews, milestones, slippage, fees and retention.

Appointing an external investigator transfers a task, not a duty. Work health and safety obligations stay with the employer throughout, including the psychosocial risk the investigation creates. The model code of practice on managing psychosocial hazards at work and WorkSafe Victoria's material on work-related stress are useful references, though duties vary between jurisdictions. Communication, welfare, interim risk controls and protection against retaliation stay in-house.

Interim measures deserve care. Adjusting duties, changing reporting lines or directing someone not to attend must be proportionate and precautionary; framed or applied as punishment, they may be perceived as punitive or as prejudgment. Review them as the picture develops rather than leaving them in place by inertia.

When the report arrives, read it critically. Are allegations clearly stated? Was adverse material put? Are findings supported by the recorded evidence? A report is evidence for a decision, not the decision, and treating it as an automatic outcome may expose a later employment decision to challenge under applicable legislation such as the Fair Work Act 2009, or under policy, contract or an industrial instrument. Where reasonably practicable, a separate decision-maker should consider the report and give the respondent a genuine opportunity to address the material relied on and any proposed disciplinary action — good practice, not an invariable legal requirement.

The most common failures are reflex decisions either way: going external whenever something feels difficult, or staying internal to avoid a fee. Close behind is appointing someone with an unexamined conflict, or without standing to question the people who need questioning.

Then come drafting failures. Vague terms of reference produce investigations that wander; terms hinting at a preferred outcome taint what follows. Promising absolute confidentiality creates a commitment nobody can keep. A loose mandate lets the investigator slide into advocacy, counselling, mediating or making the disciplinary decision — roles incompatible with fact-finding.

Three assumptions are worth abandoning. That external appointment cures defective allegations, delay or unfairness already suffered — those travel with the matter. That the process can run without anyone attending to welfare. And that commissioning a report discharges the obligation: one never checked or acted on leaves a documented problem and no response. A workplace investigation is also not a criminal investigation, regulator inquiry, workers' compensation assessment, mediation or disciplinary decision, and conflating them is how mandates go wrong.

AWS conducts external workplace investigations, supervises and quality-reviews internal ones, and helps employers build appointment frameworks and terms of reference templates. Where timing is the question, our guide to how long a workplace investigation should take covers what drives duration. This article is general information and is not legal advice.