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Judicial and Extrajudicial Expert Work

Court-appointed expert and party-appointed expert for the parties: technical evidence handled with method at every phase, from the first review of the evidence to supporting the report at the hearing.

The judicial path: inside the lawsuit
  • Court-appointed expert: produces the official expert report, impartially, answering the questions to the expert submitted by the parties
  • Party-appointed expert (technical assistant): follows every step of the official forensic examination in defence of the client's technical interests
  • Preliminary, complementary and supplementary questions to the expert steering the evidence
  • Attendance at the examinations and verification of the court expert's methodology
  • Submissions on the expert report, dissenting technical opinion and support at the hearing
The out-of-court path: outside the lawsuit
  • Pre-examination: review of all the evidence BEFORE filing, to decide whether it is worth suing, negotiating or waiting
  • Pre-constituted evidence: the expert report ready to support the statement of claim
  • Private or administrative forensic examination: the company's internal enquiry (fraud, misconduct, incident)
  • Technical opinion for negotiation and settlement, without going to court
  • If the matter does reach the courts, all the out-of-court work becomes the foundation of the claim

Court-appointed expert registered with the courts of justice of Amazonas (TJAM), Bahia (TJBA), the Federal District (TJDFT), Minas Gerais (TJMG), Paraíba (TJPB), Paraná (TJPR), Rio Grande do Sul (TJRS), Santa Catarina (TJSC) and São Paulo (TJSP, no. 147), and with the 2nd and 3rd Region Labour Courts (TRT).

Understand it in one minute

Two paths, one and the same technical evidence

Judicial

When the lawsuit already exists

A judicial forensic examination takes place inside the lawsuit. The court appoints an impartial expert to produce the official report, and each party may retain its own party-appointed expert to draft questions to the expert, attend the examinations and file a technical opinion. This is the ground on which technical evidence decides legal arguments: whoever arrives without a party-appointed expert watches from the outside.

Out of court

Before, outside or instead of litigation

An out-of-court forensic examination is carried out at the client's initiative, without depending on a judge. It serves to establish what you actually have before acting (pre-examination), to build the evidence that will support a future claim (pre-constituted evidence), to investigate a fact internally (private or administrative forensic examination) or to underpin a negotiation. Many disputes end right here, without ever becoming a lawsuit.

Two paths for technical evidence: the courtroom and the settlement
Which path is yours?

The case is already running and there is a report or a deadline

Party-appointed expert work: questions to the expert, attendance and submissions. Every phase missed is evidence that hardens.

I am thinking of suing, but I do not know what I have

Pre-examination: feasibility review of the evidence before spending on litigation.

I need to make an internal decision within the company

Administrative forensic examination: a methodical enquiry, so that the decision holds up later.

I want to resolve this without going to court

Technical opinion for negotiation: proven facts change the balance of a settlement.

The procedure of a judicial forensic examination

The sequence imposed by the CPC and the windows it opens (arts. 465 to 477)

AppointmentThe court appoints the expert and sets the deadline for the report (CPC, art. 465, Brazilian Code of Civil Procedure). This is the order that starts the clock on everything that follows
15 daysFrom service of the appointment: the period to challenge the expert for disqualification or bias, to nominate a party-appointed expert and to submit questions to the expert (art. 465, §1)
ExaminationsThe parties are notified of the date and place on which the examinations begin (art. 474); the party-appointed expert follows every step, and supplementary questions may be submitted during the examination (art. 469)
ReportThe expert files the report at least 20 days before the evidentiary hearing (art. 477)
15 daysA common period for the parties to comment on the report and for the party-appointed expert to file a technical opinion, including a dissenting one (art. 477, §1)
ClarificationsThe expert clarifies the disputed points in writing within 15 days (art. 477, §2); if the need persists, the expert attends the hearing (§3). Matters left unclear may justify a second forensic examination (art. 480)
Practical reading

Every deadline in the procedure is a window for technical action. A window missed does not reopen.

Whoever lets the 15 days from the appointment lapse enters the examination with no questions of their own and with no technical eyes on the examinations. Whoever lets the 15 days from the report lapse watches the evidence harden without technical challenge. The role of the party-appointed expert is to fill each of those windows with content the court must take into account.

When counsel should call an expert in

Phase by phase: what the party-appointed expert does at each moment

Before filingPre-examination of the evidence: feasibility of the legal argument, preservation of whatever may disappear, and pre-constituted evidence to support the claim
Claim and defenceTechnical grounding of the requests, a well-defined application for a forensic examination and proposed questions to the expert from the very first pleading
AppointmentFormal nomination as party-appointed expert and drafting of the questions that steer the report where the legal argument needs it to go
ExaminationsAttendance at the examinations and verification of the method, tooling and chain of custody adopted by the court-appointed expert
Report filedCritical analysis, request for clarifications and a technical opinion, concurring or dissenting, within the common 15-day period
Hearing and appealSupport for the examination of the expert at the hearing and technical grounds for appeals, including to the higher courts

An expert is not allowed the possibility of error

An error in a report confirmed by the court is no small matter: it may amount to false expert evidence, with civil and criminal liability for the professional. That is the standard governing every report and every opinion signed here, and it is the same standard against which the opposing report is measured, point by point, when acting as a party-appointed expert.

How fees are set

On a court appointment, the procedure is the one laid down in the CPC: the expert submits a fee proposal, a curriculum vitae and contact details (art. 465, §2); the parties may comment on the proposal (§3); the court fixes the amount and may authorise an advance payment of part of the fees at the start of the work (§4). Who bears the cost follows the procedural rules: as a rule, the party that applied for the examination pays the advance, and the final allocation follows the outcome of the case.

The party-appointed expert, in turn, is paid by the party that nominates them (art. 95), outside the court's fee assessment.

In retained work (party-appointed expert work, technical opinion, pre-examination, out-of-court forensic examination), the proposal is drawn up case by case, after the feasibility review. The factors that weigh in are: the volume of material to be examined, the technical complexity, the procedural deadlines, examinations and travel, and any support required at a hearing.

There is no public price list, because no two cases are alike: the scope is agreed in writing before the work begins, at a fixed fee or at an hourly technical rate.

Types of engagement
  • Court-appointed expert
  • Party-appointed expert for the parties
  • Preliminary forensic examination (technical forensic case-building)
  • Adversarial forensic examination (technical forensic defence)
  • Out-of-court forensic examination for pre-constituted evidence
  • Independent technical opinion
  • Attribution of authorship in crimes committed on social media and the internet
  • Forensic examination of databases and ERP systems
Frequently asked questions on this practice
What is the difference between a judicial and an out-of-court forensic examination?
The judicial one takes place inside the lawsuit, either by court appointment or through the parties' own experts. The out-of-court one takes place before or outside the lawsuit: it produces pre-constituted evidence, underpins negotiations and settlements, and often avoids the dispute altogether, or wins it before it begins.
What is a pre-examination?
It is the examination and analysis of all the evidence the client believes they have, carried out before any litigation. The pre-examination establishes what evidence actually exists: whether it justifies filing a claim, whether it is worth attempting an out-of-court settlement, or whether the best course is not to act yet. In short, it is the assurance of taking the next step, whether litigation or negotiation, knowing there is evidence to prove what you intend to prove.
What is a private or administrative forensic examination?
It is a forensic examination carried out outside court proceedings, generally at a company's initiative, to investigate an internal matter: whether an employee complied with their duties, a suspicion of fraud, an incident. It is also a form of out-of-court forensic examination, a term that simply means "outside court proceedings". The result supports administrative decisions and, if the matter escalates, may ground a future claim.
What are questions to the expert and who drafts them?
Questions to the expert (quesitos) are the technical questions the court-appointed expert must answer. The parties draft them through their lawyers, ideally with the support of a party-appointed expert, within 15 days of service of the appointment (CPC, art. 465, §1); supplementary questions may still be put during the examination (art. 469). A well-built question steers the examination where the legal argument needs it; a generic question yields a generic answer.
Which deadlines in a forensic examination must never be missed?
Two are critical. The first: 15 days from service of the appointment order, to challenge the expert for disqualification or bias, nominate a party-appointed expert and submit questions to the expert (CPC, art. 465, §1). The second: a common period of 15 days after notice that the report has been filed, for the party's submission and for the party-appointed expert's opinion (art. 477, §1). Once the first window is lost, the examination proceeds without technical direction from the party; once the second is lost, the report tends to harden without any technical challenge.
What is a dissenting technical opinion?
It is the document in which the party-appointed expert analyses the official report and shows, with reasons, where the method, the examinations or the conclusions do not stand up: unsuitable tooling, a weak chain of custody, a question answered incompletely, a conclusion the data do not support. Filed within the period of CPC, art. 477, §1, it forces a technical debate: the expert must clarify the disputed points, and the court then decides in the light of two reasoned readings rather than only one.
Is the judge bound to follow the expert's report?
No. The CPC (art. 479) requires the judge to assess the expert evidence stating the reasons behind their conviction, taking into account the method used by the expert, and allows a decision that departs from the report. That is precisely why a well-reasoned technical opinion matters: it gives the court the rational basis not to follow a flawed report.
The official report came out with an error. What can still be done?
The procedure offers a ladder of responses: a request for clarifications from the expert (art. 477, §2), a dissenting technical opinion within the statutory period, examination of the expert at the hearing (§3) and, where the matter remains insufficiently clarified, an application for a second forensic examination (art. 480). Each rung demands precise technical reasoning: pointing out the right error, in the right way, is the work of a party-appointed expert, not of intuition.
Can I use a technical opinion to negotiate without going to court?
Yes, and it is one of the smartest uses of forensic work: an out-of-court opinion demonstrates the facts technically and shifts the balance of a negotiation. If no settlement follows, the work has already prepared the ground for litigation.
How do the fees work?
In retained work (party-appointed expert work, technical opinion, out-of-court forensic examination), the proposal is drawn up case by case: a fixed fee or an hourly technical rate, with the scope agreed in writing before the work begins. On a court appointment, the expert submits a proposal, the parties comment and the court fixes the amount, under the procedure of CPC, art. 465; the party-appointed expert is paid by the party that nominates them.
I missed the deadline to nominate a party-appointed expert. What now?
Not everything is lost: even outside the ideal moment, a technical opinion can ground submissions on the report, support appeals and assist counsel in the following phases. The earlier the technical expert comes in, the more options there are.

Party-Appointed Expert's Guide (PDF)

The forensic examination deadlines under the CPC, the checklist for preserving digital evidence and the golden rules for questions to the expert, in one document to keep and use on the next case.

Download the guide

See also

For Lawyers →   Expert Reports and Opinions →   Computer Forensics →

Completed cases
ANONYMISED CASE

Civil claim against a financial institution involving fraud in an electronic signature

Engagement as party-appointed expert. Forensic analysis of the electronic signature platform revealed flaws in the authentication process, grounding a favourable decision at first instance.

PUBLIC CASE

Nationally reported case of a data breach at a large company

Technical consultancy and participation as a specialist in interviews for Record TV, SBT, Rede TV, Band and TV Cultura.

Representative cases

The level of work you are engaging

Before deciding, it is worth seeing what has already come through this laboratory: cases described without identifying the parties, in the format of challenge, method and result.

See all representative cases →

The technical evidence your case requires. The authority courts respect.

Initial feasibility consultation at no cost. Reply within 24h on business days.
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