When a legal or corporate case depends on digital data, sooner or later a technical expert gets involved. Their job is to explain to whoever must decide, a judge, a company, a lawyer, what the data shows and what it does not. It is a role that requires technical skill, but also the ability to communicate and a strong sense of limits: the expert sheds light on the facts but does not replace whoever weighs them.
The different roles
In everyday language people speak of a "computer expert", but the roles differ depending on who gives the engagement and in what context. The following reflects the Italian system, though similar distinctions exist elsewhere.
| Role | Appointed by | Function |
|---|---|---|
| Court-appointed expert in civil cases (CTU) | The judge | Assists the judge, answers the questions set |
| Court-appointed expert in criminal cases | The judge | Assists the judge with technical assessments |
| Party-appointed expert (CTP) | One of the parties | Assists the party, follows operations and submits observations |
| Prosecution expert | The prosecution, during investigations | Carries out assessments on behalf of the prosecution |
| Corporate consultant | A company or professional | Internal analyses, often before any proceedings |
A party-appointed expert is not a "technical lawyer" who must defend the client's position at all costs. Their value depends on credibility: technically sound observations, even when they acknowledge weak points, carry more weight than an unconditional defence.
How an engagement is set up
Understanding the questions
The first task is to turn the issue into precise technical questions. "We want to know whether the employee stole data" becomes, for example: "Were external devices connected to the computer during the period in question? Were files sent to addresses outside the company? Were files deleted during that period?". Clear questions prevent scattered analysis and off-topic conclusions.
Checking what is available
The sources are listed: devices, accounts, logs, backups. You check what condition they are in, who has had custody of them and whether copies or analysis attempts have already been made.
Defining timing and limits
A full analysis of a smartphone or server can take days. It helps to clarify from the start what is realistic, in what time frame, and which results are not guaranteed, for example recovering deleted data from an SSD.
Independence and conflicts
Before accepting, the expert checks that they have no relationships with the other parties or interests that could compromise their impartiality. For a court-appointed expert this is an essential requirement.
Work during the operations
When there are several experts, the court-appointed one and those of the parties, technical operations normally take place with everyone able to attend. The party-appointed expert can:
- check that acquisitions are carried out correctly;
- ask for details to be recorded or additional checks to be performed;
- obtain a copy of the acquired data, where allowed, for independent analysis;
- submit written observations on the draft report.
A correct, collaborative relationship between experts, even with different positions, benefits everyone: technical disputes are resolved during operations instead of dragging on into hearings.
Working with the lawyer
The party-appointed expert and the lawyer work together, but with different skills. The lawyer knows the procedural rules and the strategy; the expert knows the data. Some practical advice:
- involve the expert as early as possible, ideally before anyone touches the devices;
- share all relevant technical documents with them, including those from the other side;
- ask for simple explanations: if the expert cannot explain a point to the lawyer, they will hardly manage to explain it to the judge;
- distinguish what the expert can state with certainty from what is merely consistent with a theory.
The qualities that matter
In my work I have seen that technical skills are necessary but not sufficient. Equally important are:
- method: every step documented and repeatable;
- clarity: explaining technical concepts without jargon;
- caution: not going beyond what the data proves;
- staying current: systems, apps and devices change constantly;
- intellectual honesty: acknowledging a mistake or a limit strengthens credibility.
In short
- The technical expert explains the data to whoever decides, without replacing them.
- There are different roles: court-appointed, party-appointed, prosecution, corporate.
- A good engagement starts with precise technical questions and an inventory of sources.
- A party-appointed expert is valuable for their credibility, not for unconditional defence.
- Involving them early avoids irreparable mistakes on the devices.