What Happens to the Evidence After an Investigation?

What Happens to the Evidence After an Investigation?

Short answer: At the end of an investigation, you receive a written report along with all supporting evidence. The investigation agency retains a secure copy for a defined period in case it is needed for legal proceedings or follow-up work. After that retention period, all data is securely destroyed in line with UK data protection law. You, as the client, own the results of the investigation and decide what to do with them.

What You Receive

When an investigation is completed, the agency provides a case report that sets out:

A summary of the instructions received. A description of the methods used. A detailed account of what was observed, found, or established. Dates, times and locations for each piece of evidence. Supporting material, including photographs, video recordings, copies of documents, and records of database searches.

The report is prepared to a professional standard that is suitable for use in court proceedings if needed. Even if you do not intend to go to court, a clear, well-structured report is the best way to present the findings and make informed decisions.

Reports are typically delivered electronically in PDF format, with video and photographic evidence provided as separate files. Physical copies can be produced on request, particularly where solicitors or courts require original or hard-copy documents.

Who Owns the Evidence

The evidence belongs to you, the client. You instructed the investigation, you paid for it, and the results are yours. You decide whether to share the report with your solicitor, present it in court, use it in a business decision, or keep it private.

However, there are limits on what you can do with certain types of evidence. Personal data about other individuals is still subject to UK data protection law even after it has been handed to you. You cannot publish surveillance photographs of a private individual on social media, for example, without considering their rights under the Data Protection Act 2018. Your solicitor can advise on what is and is not appropriate in your specific circumstances.

How Agencies Store Evidence

Reputable investigation agencies store case files securely for a defined period after the investigation ends. This retention serves several purposes:

Legal proceedings. If the case leads to court action, the original evidence and the investigator’s notes may be needed months or even years later. Having a secure copy available means the agency can respond to court requests, produce additional copies of evidence, and prepare the investigator to give testimony.

Follow-up instructions. Clients sometimes return weeks or months after an investigation with new questions or a request to continue the work. Having the original case file available means the investigator does not need to start from scratch.

Professional accountability. If questions are raised about how an investigation was conducted, the agency’s records provide a clear audit trail showing what was done, by whom, and on what basis.

Data Protection and Retention Periods

UK data protection law requires that personal data is not kept longer than necessary for the purpose for which it was collected. For investigation files, this means agencies must set a retention period, and must destroy files securely once that period has passed.

Retention periods vary between agencies, but a typical period is six years from the date of the final report. This reflects the limitation period for most civil claims in England and Wales, meaning evidence is available for as long as it might reasonably be needed for legal proceedings.

At UKPI, we retain case files securely for six years unless the client instructs us otherwise or there is a legal reason to keep them longer. After the retention period expires, all data, including electronic files, photographs, video recordings, notes and correspondence, is securely destroyed.

Secure Destruction

Secure destruction means the data cannot be recovered. For electronic files, this involves permanent deletion using methods that overwrite the data so it cannot be retrieved from storage media. For physical documents, secure shredding is used.

The destruction process is logged, and clients can request confirmation that their case file has been destroyed. This is particularly important in sensitive cases where the existence of the investigation itself is confidential.

What If the Case Goes to Court

If the evidence from an investigation is used in court proceedings, the rules change slightly. Once evidence forms part of a court case, retention is governed by the court’s requirements and the rules of procedure rather than the agency’s standard retention policy. In practice, this means the agency will keep the file for as long as the court case is active, plus any appeal period, before applying the standard destruction procedure.

The investigator may also be required to attend court as a witness to confirm the evidence they gathered. At UKPI, our investigators are experienced in giving evidence in family courts, civil courts, employment tribunals and other proceedings. Court attendance is part of the service and can be arranged through our legal support team.

Early Destruction Requests

If you want your case file destroyed before the standard retention period ends, you can request this at any time. The agency will normally agree, provided there are no remaining legal obligations that require the file to be kept. A written confirmation of destruction will be provided.

This is useful when the investigation resolved the matter and there is no prospect of legal proceedings.

What to Ask Before You Hire

Before instructing an investigator, it is worth asking:

How long will you keep my case file after the investigation? How is data stored during and after the investigation? What security measures protect the files? Can I request early destruction? Will I receive confirmation when the file is destroyed? What happens if the case goes to court?

A professional agency will have clear answers to all of these questions and will include data handling terms in their written engagement agreement.

For a confidential discussion about your case and how we handle evidence, call UKPI on 0800 043 1754.