Files, logs, screenshots, and data copies
are very often treated as “digital evidence”.
In practice, however, court proceedings and expert analyses show that
a significant portion of such material has no real evidentiary value.
Not because the data did not exist,
but because the manner in which it was obtained, secured, or processed
prevents subsequent verification.
This article clarifies one of the most common misconceptions:
what constitutes digital evidence in a procedural sense,
and what is merely a technical illusion.
What “digital evidence” means in legal proceedings
From the perspective of a court or a law firm,
digital evidence is not “a file in itself”.
What matters in particular is:
- the ability to determine the origin of the data,
- the integrity of the material,
- the ability to verify how the material was secured,
- the absence of interference after acquisition.
If these elements cannot be demonstrated,
the material loses its evidentiary value — regardless of
how significant its content may appear.
Evidence that most often turns out to be an illusion
Screenshots without context
A screenshot:
- does not show the history of changes,
- does not confirm the origin of the data,
- does not preserve integrity.
It may have auxiliary value,
but it rarely constitutes standalone procedural evidence.
Files without documented provenance
A file provided:
- by email,
- on a USB drive,
- via a messaging application,
without information on:
- who acquired it,
- when it was acquired,
- from which medium,
does not, in practice, allow for an objective assessment.
Copies made “technically correctly” but without procedure
A common scenario:
- an administrator creates a copy,
- the data is analyzed,
- a dispute arises later.
The problem is not the technology,
but the lack of a documented evidence preservation process,
in particular the absence of a proper chain of custody.
Logs acquired after the fact
Logs are meaningful only if:
- it is known when they were generated,
- they were not modified,
- they were not overwritten.
Obtaining them weeks or months later
often means they have informational value only.
Data handled by multiple individuals
The more people who:
- had access to the data,
- copied it,
- analyzed it,
the more difficult it becomes to demonstrate
that the material has retained its original form.
Evidence with real evidentiary value
Digital material gains evidentiary value
when it is acquired:
- with potential legal proceedings in mind,
- before the escalation of a dispute,
- in a manner that allows subsequent verification.
What matters is not merely the existence of the data,
but the continuity and transparency of the evidence preservation process.
The most common mistake
The most common mistake is not the absence of data,
but the belief that digital evidence can be secured “later”.
In many cases, the moment when action should have been taken
passes unnoticed.
When there is still time — and when it may already be too late
- before a dispute or proceedings — there is usually time,
- after initial remedial actions — it may already be too late.
For this reason, the manner and timing of evidence preservation
are critical to its subsequent assessment.
Summary
Not every file is evidence.
Not all data has evidentiary value.
If digital material may, in the future,
be subject to assessment by a court, a prosecutor’s office, or a law firm,
the way it is secured is just as important as its content.
In such situations, it is advisable to seek consultation
before further technical actions are taken.
📧 biuro@wichran.pl
📞 +48 515 601 621
Piotr Wichrań
Court-appointed expert in computer science
Digital Forensics and IT/OT Cybersecurity Expert
Licensed Private Investigator