Does digital evidence really need a chain of custody?

Yes. Files can be altered, so the trail from capture to exhibit — who handled it, when, and that the original is preserved unaltered — is exactly what answers that at authentication.

What does a defensible trail include?

Capture metadata and timestamps, controlled storage and transfer, documentation of who handled the file, and preserved originals — so the record shows what's offered is what was collected.

Can you establish custody after the fact?

Not credibly — chain of custody is built from the first frame by handling the capture correctly throughout. It's a discipline maintained from the field, not a document added at the end.

Chain of Custody for Digital Capture, Step by Step

Earl Bakke
Aug 19
4 min read

Chain of Custody for Ground and Aerial Imaging in the Digital World

Chain of custody is not limited to physical items placed in evidence bags. Digital photographs, video, Orthomosaics, point clouds, thermal captures, and other ground- or aerial-imaging products also require a defensible record of their origin, handling, preservation, and production.

For digital imaging, the objective is straightforward: establish a reliable foundation that the exhibit offered is the image, recording, or derived product that it is represented to be—and that it has been preserved and handled in a manner that permits the court to assess its authenticity and reliability.

Court Room admission of digital evidence from a camera or drone.

What custody means for a digital file

For a digital capture, chain of custody is the documented history of the file from acquisition through presentation. It should permit a witness to explain:

Who captured or acquired the data.
When and where the capture occurred.
What equipment, sensors, software, and settings were used.
How the original data was transferred, stored, accessed, and backed up.
Who had possession of, or access to, the data at material stages.
What processing, if any, produced the exhibit being offered.
Whether the native or original files remain preserved for review.

The relevant question is not simply whether an image appears accurate. It is whether the proponent can offer a competent, documented basis for identifying the image or output and explaining its path from field capture to courtroom exhibit.

Why digital imaging requires documentation

Digital evidence can be copied, exported, converted, enhanced, cropped, stitched, colorized, annotated, or otherwise processed without visible indication of the underlying workflow. That does not make a digital exhibit unreliable or inadmissible. It does, however, make documentation of the original capture and subsequent handling especially important.

A well-maintained record gives counsel and the court a basis to distinguish among:

The original or native capture.
A forensic or working copy.
A processed derivative, such as an orthomosaic, panoramas, 3D model, video export, annotated photograph, or demonstrative exhibit.
Any enhancement, measurement, interpretation, or analytical output prepared from the source data.

The goal is transparency: to show what was collected, what was done to it, who did it, and whether the offered exhibit fairly and accurately represents the underlying evidence.

Elements of a defensible record

A practical digital-imaging custody record commonly includes the following:

Capture records: Date, time, location, operator, platform, sensor, flight or collection log, and relevant acquisition settings.
Native data preservation: Retention of original image, video, thermal, LiDAR, or other sensor files in their native formats, with associated metadata preserved where practicable.
Transfer documentation: The method and date of transfer from the camera, aircraft, controller, storage media, or field device to secure storage.
Access and handling log: Identification of individuals who received, copied, reviewed, processed, or exported the data, together with the date and purpose of each material action.
Controlled storage: Storage practices designed to protect files from loss, overwriting, unauthorized modification, or uncertainty about which version is authoritative.
Processing documentation: Software and version used, workflow steps, relevant settings, source files used, and the identity of the person who performed the processing.
Derivative-product identification: Clear labeling of exhibits as original captures, copies, processed products, measurements, visualizations, or demonstratives.
Integrity verification where appropriate: File inventories, hashes or checksums, audit logs, write-protection practices, and retained source media can provide additional support for file integrity.

Not every matter requires every safeguard. The appropriate foundation depends on the nature of the evidence, the issues in dispute, the governing rules, and the anticipated challenge. But preserving native data and documenting the workflow are sound practices whenever digital imaging may be used in litigation.

Built from first capture

A custody record is strongest when it begins at the time of collection. It is difficult to reconstruct, after the fact, who had access to a file, which version was used, or whether a particular export accurately reflects the original data.

For that reason, field personnel and imaging vendors should treat each collection as potentially subject to later examination. The capture date, source media, transfer method, storage location, processing history, and derivative exhibits should be documented contemporaneously—not recreated only after a dispute arises.

Common questions

Does digital evidence need a chain of custody?

Digital evidence requires authentication. A documented chain of custody is often an important means of establishing that foundation, particularly when the origin, integrity, handling, or processing of the file may be disputed. The governing standard is generally whether the proponent has produced sufficient evidence to support a finding that the item is what it is claimed to be.

What should a defensible digital-imaging record include?

At a minimum, the record should identify the capture, the source files, the people who handled or processed the data, the manner of storage and transfer, and the relationship between any exhibit and the original data. For processed aerial products, it should also identify the workflow that produced the output.

Can custody be established after the fact?

A foundation may still be available through witness testimony, metadata, system records, retained source files, and other corroborating evidence. But a contemporaneous custody record is more reliable, more efficient to explain, and less vulnerable to claims of alteration, substitution, or uncertainty.

Are processed images or aerial products inadmissible because they are not “originals”?

Not necessarily. Processed imagery and derived products can be useful evidentiary or demonstrative materials when their source data, methodology, and limitations are clearly explained. The critical issue is whether the witness can establish what the exhibit is, how it was created, and whether it fairly represents the underlying data or scene.

Next step

Need imaging collected and documented with courtroom use in mind? Contact us to discuss our end-to-end workflow for preserving source data, documenting custody, and preparing ground or aerial imaging products for authentication and evidentiary foundation.

We are prepared to explain that workflow step by step—including in a cross-examination-style review—so counsel understands the underlying data, processing history, and supporting documentation.

Discuss a Matter

About the author

Earl Bakke, founder of ScenePhoto360 — Level II certified thermographer and FAA Part 107 drone pilot.

Earl Bakke is a Level II Certified Thermographer and FAA Part 107 pilot with night-operations authorization. Twenty years in law enforcement and crash reconstruction, 450+ thermal inspections, and testimony in criminal and civil proceedings. He founded ScenePhoto360 in Stillwater, Minnesota. Read the full background.