Expert assessments and technical consulting enter criminal proceedings when a piece of evidence cannot be understood solely through accounts, documents, or photographs. Medical, IT, ballistic, accounting, genetic, or engineering expertise may be required. If you have received an assessment notice, a technical report, or a summons for the conferral of an assignment, it is natural to wonder what is happening and whether a decision has already been made regarding the facts.
The essential point is that expert assessment and technical consulting are not the same thing. I want to help you distinguish the expert appointed by the judge from the consultants appointed by the parties, understand why it matters to establish whether an examination is repeatable, and recognize the moments when the participation of the defense can truly affect the way evidence is formed.
Expert Assessment and Technical Consulting: The Difference to Understand Right Away
The expert assessment is a means of evidence ordered by the judge. Article 220 of the Code of Criminal Procedure admits it when investigations, data, or evaluations requiring technical, scientific, or artistic skills are necessary. Therefore, it is not enough for an issue to appear difficult: there must be a concrete problem that the judge cannot solve with common knowledge alone. The reference is Article 220 of the Code of Criminal Procedure.
The expert is not a technician for either party. They receive their assignment from the judge and answer the questions established in the appointment order. The questions outline their work: they may concern, for example, the origin of an injury, the compatibility of a trace, the operation of a device, or the technical reconstruction of an event. A report that strays from those questions or turns technical evaluations into judgments on criminal liability requires particular attention.
Technical consulting instead expresses a party's technical position. The public prosecutor may make use of their own consultants during investigations; the suspect, the defendant, and other private parties may appoint a consultant through defense counsel in the cases provided for. The consultant does not replace the judge and does not decide the trial, but they can identify the limits of the method followed, propose alternative readings of the data, and explain why a result does not allow for a certain conclusion.
The presence of a consultant does not make an expert assessment automatic. A public prosecutor's consultant's report can exist without the judge having yet ordered any expert assessment. Similarly, in an expert assessment already ordered, the parties can assist the expert with their own consultants. The useful question is not only "is there a technician?", but "who appointed them, what assignment did they receive, and in what phase of the proceedings do they operate?".
When Technical Consulting Appears During Investigations
During investigations, the public prosecutor may appoint a technical consultant. This is a frequent choice when external skills are needed to analyze data, objects, places, devices, or physical conditions. An analysis of call logs, the extraction of data from a phone, a medico-legal examination, or a verification of evidence may require this support even before a judge intervenes regarding the evidence.
Not all investigations carry the same procedural weight. Some can be repeated later on the same things, on the same preserved data, or with new verifications. Others inevitably modify the examined material or concern situations destined to change. The distinction between repeatable and non-repeatable investigations does not depend on the technical name of the examination, but on the concrete possibility of redoing it under significant conditions.
Non-repeatable technical examinations require enhanced safeguards. Article 360 of the Code of Criminal Procedure concerns examinations of persons, things or places whose condition is subject to change. The public prosecutor must promptly notify the person under investigation, the victim and defence counsel of the day, time and place fixed for appointing the expert, and of their right to appoint technical consultants. Counsel and consultants may attend the appointment, participate in the examinations and make observations and reservations. See Article 360 of the Code of Criminal Procedure.
The defence can seek the taking of evidence before a judge. Before the expert is appointed, the person under investigation may reserve the right to request an evidentiary hearing (incidente probatorio). The reservation expires and cannot be renewed unless the hearing is requested within ten days. In the cases provided for by law, this procedure allows evidence to be taken before the trial, before a judge and with the parties participating.
Urgency has a specific legal meaning here. While the reservation remains effective, the public prosecutor must suspend the examinations unless postponing them would make it impossible to carry them out usefully later. A generic claim of prejudice to the investigation is insufficient. If the prosecutor proceeds outside that exception, the results cannot be used at trial. The nature of the material, whether it can be preserved and the technical reason why the examination cannot wait are therefore essential.
What Happens When the Judge Orders an Expert Assessment
The judge must indicate the subject of the technical investigation. The expert assessment stems from an order that appoints the expert and formulates questions. A well-constructed question asks to ascertain technical facts: what data are present, what operations were performed, what results are compatible with the available traces. It should not ask the expert to declare whether a person is guilty, because the decision on liability remains with the judge.
The parties may also participate in the expert assessment. The code allows for the appointment of party technical consultants in relation to the expert assignment. The consultant can assist with operations, formulate observations and reservations, propose useful investigations, and discuss the method. This function is important especially when an initial technical choice, such as sampling, the software used, the comparison parameter, or the margin of error, conditions the entire conclusion.
A technical report is not a judgment. The expert must explain the path followed and the basis of their conclusion; consultants can highlight gaps, incompatible data, or founded alternative hypotheses. The judge evaluates the evidence together with the other elements of the trial. A conclusion expressed in probabilistic terms, the absence of comparable evidence, or the lack of documentation of operations can have a very different significance compared to objective, preserved, and verifiable data.
The possibility of cross-examining the technician at a hearing also matters. If the expert or consultant is examined, the questions do not concern only the final outcome. They can concern the materials received, the method, the tools, the alternatives discarded, the limits of the analysis, and the actual meaning of the words used in the report. A persuasive expert assessment must be capable of being explained and verified, not merely filed.
When to Request an Expert Assessment or Assert a Party Consulting
The expert assessment should be requested when technical evidence entrusted to the judge is necessary. It can be useful if the decisive fact is not already clarified by a reliable investigation or if an investigation requiring the powers and safeguards specific to judicial authority is needed. However, it is not a tool to obtain a second report simply because the first conclusion is unfavorable: it is necessary to indicate which technical issue remains open and why it can affect the contested facts.
Party consulting is useful even without an expert assessment. It can serve to critically review a public prosecutor's report, verify IT support, reconstruct a chronological sequence, or document defensive investigations. Private parties may appoint their own consultants even outside of expert assessment cases; the consultant can express their opinion and submit briefs. It is not necessary to wait for the judge to appoint an expert to raise a well-founded technical issue.
Defense technical investigations require caution if they are non-repeatable. Article 391-decies provides that defense counsel must give notice without delay to the public prosecutor when intending to carry out a non-repeatable technical investigation, so as to allow the exercise of powers compatible with Article 360. The rule thus distinguishes defensive technical initiatives from acts reserved for the judge, but prevents non-repeatable checks from taking place without cross-examination. The reference is the regulations on defensive investigations on Normattiva.
The choice depends on the missing evidence, not on the label of the act. If an element destined to change needs to be preserved or analyzed, the priority is to prevent cross-examination from arriving too late. If the material is available and the analysis is verifiable, consulting can clarify beforehand whether there are technical reasons to urge an expert assessment. If, on the other hand, the problem is purely legal, a technician cannot resolve it in place of the judge.
Technical Facts That Can Change the Meaning of Evidence
The first piece of data is what the technician actually examined. A conclusion about a file depends on the availability of the original, the copy used, the acquisition methods, and the documentation of operations. In a medico-legal issue, the available clinical examinations, the timing of the observation, and the possibility of comparing prior or subsequent data matter instead. Without these elements, the result may have a limit that must be declared.
The method must be suitable for the question asked. Two technicians may not disagree on the data, but on how to interpret them. A method may indicate compatibility, not identification; it can reconstruct a plausible scenario, not prove that it is the only possible one. To understand a report, reading the conclusion is not enough: one must distinguish between what was observed, what was calculated, and the final inference proposed by the technician.
The preservation of evidence can be decisive. If a sample is consumed in analysis, if a device is modified during data extraction, or if a place changes before inspection, the possibility of counter-verification is reduced. Not every modification renders the investigation unusable, but it can make the documentation of the act and compliance with the safeguards provided for non-repeatable activities essential.
The technical question must not be confused with the overall reconstruction of the event. A consultant can explain which dynamics are compatible with certain traces; the judge must then compare that data with statements, documents, timing, motives, and any other admitted evidence. The mistake to avoid is treating the report as if it automatically cancels out all other elements, or as if it renders a critical verification of its path superfluous.
How to Navigate After a Notice or a Technical Report
The deadline indicated in the act must be taken seriously. A notice of assignment conferral or technical investigation signals an activity with a specific date, place, and subject. It must not be confused with a generic summons: one must understand whether it concerns a public prosecutor's consulting, a judge's expert assessment, a non-repeatable technical investigation, or an evidentiary hearing. The decision-making subject changes, the possibility of intervening changes, and the useful time to appoint a consultant may change.
The report should be read starting from the questions and the data. Check what question the technician was supposed to resolve, what materials they received, what operations they declare to have performed, and how clear or conditional the conclusions are. The final pages matter, but they are not enough. An apparently categorical conclusion may rest on limited data; a cautious conclusion may instead be consistent with solid but non-unambiguous materials.
At least two paths exist that do not always exclude each other. One can contest the existing report with targeted technical arguments; or one can ask the judge to order an expert assessment on an unresolved issue. The first path tests the method and conclusions of the document; the second aims to introduce judicial technical evidence. The choice changes if the evidence is still available, if the act is repeatable, and if the controversial point is truly decisive.
A few targeted acts are useful for the initial comparison. The notice received, the decree or appointment order, the questions, the record of operations, and the technical report allow one to understand the phase and the concrete problem. If you already have these documents, we can jointly identify whether the issue concerns cross-examination, the repeatability of the investigation, the method followed, or the need for different technical evidence. You can contact me to examine the situation.
Frequently Asked Questions
Can I appoint a technical consultant if the judge has not ordered an expert assessment?
Yes, party consulting can exist even without an expert assessment. In criminal proceedings, private parties can appoint their own consultants to address a technical issue, submit observations, or state an opinion. The choice is useful if a prosecution report already exists, if technical data needs to be documented, or if it is necessary to understand whether there are concrete grounds to ask the judge for an expert assessment.
Is the judge's expert assessment always more important than party consulting?
No, there is no automatic ranking. The expert assessment is ordered by the judge and has its own function, but party consulting can also highlight methodological errors, omitted data, or conclusions that need to be scaled down. The judge must evaluate the content, reliability, and coherence of the documents, rather than simply favoring a report based solely on the party who appointed the technician.
What does non-repeatable technical investigation mean?
It means the condition of a person, thing, or place can change. The examination cannot be postponed or redone without losing significant data, because the operation itself or the passage of time modifies the object of analysis. In these cases, Article 360 of the code provides for notices and participation rights to protect technical cross-examination before data is no longer verifiable.
Can I contest a technical report that has already been filed?
Yes, but the contestation must be precise. It can concern the questions, the materials examined, the method, the logical steps, the documentation of operations, or the meaning attributed to the results. Simply saying you disagree with the conclusion is not enough. One must distinguish personal dissent from a technical objection capable of showing a concrete limit of the document.
Can technical consulting establish whether I am guilty?
No, the technician does not pronounce guilt. Experts and consultants can clarify specialized data and indicate which hypotheses are compatible with them. The decision on liability instead requires the overall evaluation of the evidence and belongs to the judge. Precisely for this reason, it is important to avoid questions that ask the technician for legal conclusions rather than technical assessments.