Capture, Store, Manage: Getting Digital Evidence Right

By Bob Denaro (KPM) BDG Training Team · April 2026

Digital evidence must be captured with a clear legal basis, protected by layers of security and unbroken audit trail, stored on access-controlled systems and for voluminous digital material early prosecutor engagement from the start.

Handled incorrectly, digital material can be ruled inadmissible, expose your investigation to legal challenge, or collapse a prosecution entirely. Digital material now features in virtually every criminal or civil investigation — these standards are the foundation of evidential integrity.

The four-stage framework

1. Capture

Establish a clear legal basis before seizing any device. Use write-blockers when imaging to prevent alteration of original data. Photograph devices in situ and document their condition at the point of seizure.

2. Integrity

Ensure a full audit log of any transfer of Digital evidence (for example via digital devices, mobile phone, camera, bodycam, emails, social media). Ensure that the Master exhibit is generated at the point of original transfer and the same levels of protection are applied as though it was placed in a tamperproof bag and sealed. Measures such as Password protection, encyption and generating a hash value at the point of capture and again on each subsequent access ehnances the integrity of the exhibit. Document who accessed the material, when, and for what purpose — creating an unbroken audit trail from seizure to court.

3. Storage

Store all evidential material on access-controlled, audited, backed-up systems only. Never use personal drives or unapproved cloud services. Ensure a working copy is produced and this is an exact duplicate of the original digital exhibit, use your authority's approved Digital Evidence Management System where available.

4. Scheduling

In the case of Digital evidence being identified as relevant unused non-sensitive or senstive material, use metadata to supplement descriptions in high-volume cases and ensure compliance with Annex A of the Attorney General's guidlines on Disclosure. Engage your prosecutor before charge to agree the approach — do not manage disclosure in isolation.

Minimum storage standards

•       Access restricted to named individuals on a need-to-know basis

•       All access and movements should be logged and recorded

•       Master evidential Digital exhibits should be stored with the same principles as physical exhibits as if it was placed into a tamperproof evidence bag, sealed and stored in an exhibits store. Master and working copies held separately

•       Retention in line with your authority's schedule and CPIA obligations

•       Backups verified regularly

Social media evidence — a word of caution

Screenshots alone are generally insufficient as evidence. Capture the full URL, page title, timestamp and any available metadata at the point of preservation. For platforms that may remove content, consider whether a specialist tool or the platform's own legal process is needed to preserve evidential integrity. If in doubt, seek advice before proceeding.

Training that covers this

BDG's Statements, Exhibits and Digital Evidence and CPIA Disclosure courses cover digital evidence handling end to end, tailored to your authority's systems and case types. Email info@bdgtrainingconsultancy.co.uk.

This article is adapted from the BDG Investigator Bulletin, Edition 1 (April 2026). Download the full edition free — and subscribe to receive each monthly edition by email.

This article is provided for professional development purposes and does not constitute legal advice.