“You Can Hire a PI to Dig Up Dirt on Anyone” – Ethical and Legal Limits

“You Can Hire a PI to ‘Dig Up Dirt’ on Anyone” – Ethical and Legal Limits

The bottom line: Reputable private investigators do not “dig up dirt.” They gather facts. The distinction matters. Professional investigation work is governed by law, professional ethics, and the principle of proportionality. An investigator who agrees to find damaging material on someone without a legitimate purpose is operating outside the law and outside professional standards. If this is what you are looking for, you are unlikely to find a reputable firm willing to take the work, and the consequences of using an unscrupulous one can be severe.

Where This Myth Comes From

The idea of hiring an investigator to find embarrassing or damaging information about an opponent is deeply embedded in popular culture. Films, crime novels and tabloid newspapers have all promoted the image of the PI as someone who can be hired to find secrets, expose weaknesses and gather ammunition for personal or business disputes.

This image reflects a version of the industry that responsible practitioners have spent decades trying to leave behind. The modern UK investigation profession is governed by data protection law, privacy law, anti-harassment legislation and professional codes of conduct. An investigator who agrees to “dig up dirt” without regard to these rules is not just unprofessional; they are a liability to their client.

The Legal Limits

Purpose limitation under UK GDPR: Data protection law requires that personal information be collected for a specified, explicit and legitimate purpose. Gathering personal information about someone simply to embarrass, intimidate or damage them is not a legitimate purpose. An investigator who collects personal data without a lawful basis is breaching data protection law, and the client who instructed them may be jointly liable.

Protection from Harassment Act 1997: If the investigation amounts to a course of conduct that causes the target alarm or distress, both the investigator and the client could face criminal charges for harassment or stalking. This is particularly relevant where the investigation involves repeated surveillance, monitoring of social media, or contact with the target’s associates.

Malicious Communications Act 1988 and Communications Act 2003: If information gathered by an investigator is used to send threatening, abusive or grossly offensive messages to the target, separate criminal offences arise.

Blackmail: Using damaging information to coerce someone into doing something (or not doing something) is blackmail under section 21 of the Theft Act 1968. The maximum sentence is 14 years in prison. Gathering information with the intent to use it for coercion is a serious criminal offence, regardless of whether the information is true.

Defamation: If information gathered by an investigator is false and is communicated to third parties in a way that damages the target’s reputation, the target can bring a defamation claim. Even true information can give rise to legal action if its disclosure breaches privacy rights under Article 8 of the European Convention on Human Rights.

What Legitimate Investigation Looks Like

Professional investigation always starts with a legitimate purpose. The most common purposes include:

Litigation support: Gathering evidence to support or defend a legal claim. This might involve locating witnesses, documenting the movements of a party, or verifying claims made in court filings. The purpose is to assist the court in reaching a just outcome, not to embarrass or intimidate the other side. Our legal support team works with solicitors and barristers on these cases.

Fraud detection: Investigating suspected fraud, whether by employees, business partners, insurance claimants or others. The purpose is to protect the client’s legitimate interests by identifying dishonest conduct and gathering evidence for legal proceedings or internal disciplinary action. See our fraud investigation services for more detail.

Due diligence: Checking the background of a potential business partner, investor, contractor or employee. The purpose is to verify claims, identify risks and make informed decisions. Our business partner due diligence service is designed for exactly this purpose.

Child welfare: Investigating concerns about a child’s welfare or safety. The purpose is to protect the child, and the investigation must be conducted with particular sensitivity and within strict legal boundaries.

Missing persons: Locating people who have lost contact with family members, or finding debtors, beneficiaries or witnesses. The purpose is to reconnect or to serve legal documents, not to gather personal information for its own sake. Our people tracing service handles these cases.

In each case, the investigation is directed at answering specific questions and gathering specific types of evidence. The investigator does not set out to find anything and everything they can; they focus on what is relevant, proportionate and lawfully obtainable.

The Proportionality Test

UK law applies a proportionality test to investigative activity. This means the methods used must be proportionate to the seriousness of the matter being investigated. Covert surveillance of an employee suspected of a minor expenses discrepancy, for example, would be disproportionate. Covert surveillance of an employee suspected of stealing hundreds of thousands of pounds in collusion with a supplier would be proportionate.

The same principle applies to the scope of the investigation. Investigating every aspect of someone’s life, their relationships, medical history, financial position, social activities and personal habits, is only justified where each element is directly relevant to the matter under investigation. Casting a wide net in the hope of finding something damaging is not proportionate and is not lawful.

What Happens When Clients Ask for “Dirt”

When a potential client contacts UKPI and asks us to find damaging information about someone, we ask a series of questions:

What is the specific concern? What do you believe is happening, and why? What will you do with the information if we find it? Is there a legal proceeding, employment matter, or genuine risk that justifies an investigation? Would you be comfortable explaining your reasons to a judge if challenged?

In many cases, the client has a legitimate concern that has been poorly articulated. A divorcing spouse who says they want “dirt” on their partner may actually need evidence of hidden assets for financial proceedings. A business owner who wants to “dig up dirt” on a competitor may actually have legitimate concerns about intellectual property theft or breach of a restrictive covenant.

Once the legitimate purpose is identified, we can design an investigation that addresses it lawfully and effectively. If no legitimate purpose exists, we decline the instruction.

Red Flags for Clients

If an investigator agrees to “dig up dirt” without asking about your purpose, without discussing legal limits, and without explaining what they will and will not do, treat this as a warning sign. This investigator is either willing to cut corners or does not understand the legal rules that govern their work. Either way, you are at risk.

Look for investigators who are members of recognised professional bodies such as the Institute of Professional Investigators (IPI) or the World Association of Professional Investigators (WAPI). These organisations require members to adhere to codes of conduct and professional standards.

The Right Approach

If you have a genuine concern about another person’s conduct, contact a professional investigator who will help you define the problem, identify the evidence you need, and gather it lawfully. Call UKPI on 0800 043 1754 for an honest, confidential conversation about what we can and cannot do.