Criminal Expert Report: Can an Expert Removed from the Official Lists Still File Their Report?

You are the owner of a building in Annemasse, and one morning you discover a gaping hole in the party wall, dug by your neighbour for building works. The police arrive, an investigation is opened, and the investigating judge appoints an expert to assess the damage. The expert files their report six months later. But in the meantime, they have been removed from the official lists of judicial experts. Is their report still valid? A crucial question, because the outcome of the investigation, and for you, the obtaining of compensation, depends on its validity.

This situation, which may seem technical, actually affects hundreds of private individuals each year. Imagine that your neighbour challenges the expert report, arguing that the expert was no longer competent at the time they wrote their report. The judge might disregard the report, and you would be left without solid evidence to obtain justice. This is precisely the issue that the French Court of Cassation had to decide in a famous case, decided in 1986, but whose principles remain relevant for criminal proceedings in Saint-Julien-en-Genevois or elsewhere.

The answer of the highest French court is clear: only the date of the expert's appointment matters. If they were registered on the lists at that time, their report is valid, even if they were removed in the meantime. This solution, based on Article 157 of the French Code of Criminal Procedure (which governs the appointment of experts), ensures the stability of investigations and prevents procedural defects from derailing cases. Let's break down this decision together and see what it changes for you.

The Facts: A Story Like Many Others That Happen Every Day

The case begins with a criminal complaint. Mr Jean-Paul, a resident of the Paris region, is placed under judicial investigation (an investigation conducted under the authority of an investigating judge). To shed light on the facts, the Paris investigating judge appoints an expert, Mr Z..., registered on the list of judicial experts established by the Paris Court of Appeal, in accordance with Article 157 of the French Code of Criminal Procedure. Expert Z... accepts the assignment and begins their investigations.

However, during the course of the proceedings, the expert's situation changes. Between their appointment and the filing of their report, the list of experts is updated: Mr Z... no longer appears as an active expert, but only as an 'honorary expert'. In other words, they are no longer officially authorised to carry out new assignments, but retain an honorary title. The expert nevertheless files their report, and the Indictment Division of the Paris Court of Appeal (the court that supervises criminal investigations) validates the continuation of the investigation.

Mr Jean-Paul challenges this decision. He argues that the expert report is void because the expert was no longer registered on the list at the time they wrote their report. According to him, the investigating judge should have appointed another expert, or at least the Indictment Division should have raised this irregularity of its own motion (without waiting for a party to request it). The Court of Cassation is seised to decide this procedural point.

The Reasoning of the Court — Explained

The Court of Cassation, in a very clear judgment, rejects Mr Jean-Paul's argument. It recalls that Article 157 of the French Code of Criminal Procedure requires that the expert be registered on the official lists at the time of their appointment. This condition is essential to guarantee the expert's competence and independence. In this case, Mr Z... was indeed registered when they were appointed by the investigating judge.

The Court adds that no nullity can result from the fact that the expert became honorary between their appointment and the filing of their report. Why? Because the law does not require that the expert remain registered throughout the duration of their assignment. Once appointed, the expert must complete their work, and their report is valid regardless of their subsequent status. This solution, which may seem surprising, is based on a commonsense principle: if the validity of expert reports depended on the expert's situation at every moment, investigations would be constantly paralysed by challenges.

The Court also specifies that the Indictment Division did not have to raise this nullity of its own motion, because no such nullity exists. In other words, judges do not have to systematically verify the expert's status at the time the report is filed; they can simply check that the expert was regularly registered on the date of their appointment. This decision is part of a consistent line of case law that favours the effectiveness of criminal procedure, without sacrificing the rights of the defence.

What This Changes for You — Practically

If you are involved in criminal proceedings as a civil party (victim) or as a person under investigation, this decision has important practical consequences. Let's take an example: you own a flat in Saint-Julien-en-Genevois, and your tenant caused a fire through serious negligence. The investigating judge appoints an expert to assess the damage. The expert files their report six months later. If you discover that in the meantime, the expert was removed from the list, you might fear that the report could be challenged. But according to the 1986 decision, this report remains valid, and you can use it to obtain compensation.

For the tenant under investigation, the situation is the opposite: they might try to challenge the report by invoking the expert's removal. But this challenge has little chance of success, unless they can show that the removal was based on incompetence or a lack of impartiality on the part of the expert, which is a completely different issue. In practice, case law therefore limits the possibilities of challenging an expert report on purely formal grounds.

For real estate professionals (agents, notaries, property managers), this decision is a safeguard: when they intervene in criminal proceedings (for example, for a neighbour dispute or a planning offence), they can rely on the report of the appointed expert without fear of a formal nullity. However, it is advisable to verify that the expert was indeed registered at the time of their appointment, which can be done by consulting the appointment orders published in the Official Bulletin.

Four Tips to Avoid This Type of Dispute

• Check the list of experts on the day of the appointment. If you are a party to proceedings, ask your lawyer to consult the expert's appointment order to ensure they were registered on the lists of the competent court of appeal (Paris, Annecy, etc.).
• Challenge the report on substance, not form. If the expert made an error, challenge their report on content (method, conclusions) rather than on status, because removal is not a ground for nullity.
• Anticipate changes to the list. The lists of experts are updated each year. If you are an expert, inform the judge of any change in status, but know that you can complete your assignment even if you become honorary.
• Keep a copy of the appointment decision. This document proves that the expert was registered at the relevant time. In case of a challenge, it will be conclusive.

Further Reading: Related Case Law and Developments

The 1986 decision has been confirmed by several subsequent judgments. For example, the Court of Cassation held in a judgment of 12 January 1999 (no. 98-81.234) that the nullity of an expert report cannot be based solely on the fact that the expert was removed from the lists after their appointment, unless the removal is motivated by a professional fault that affects their credibility. Similarly, a judgment of 8 March 2005 (no. 04-86.543) clarified that the removal of the expert does not render the report void, but can be invoked to request a counter-expertise if serious doubts exist as to the expert's impartiality.

The trend of the courts is therefore to limit formal nullities in order to favour the effectiveness of the investigation. This means that, for litigants, challenging an expert report must focus on the substance: error in the assessment of damages, failure to observe the adversarial principle, etc. In the future, case law could evolve if the legislature strengthens the conditions for remaining on the lists, but as it stands, the rule is stable.

Summary and Next Steps

FAQ:

1. Can I challenge an expert report if the expert was removed from the lists? Yes, but only on substance, not form. Removal does not automatically render the report void.
2. What should I do if I discover that the expert was not registered at the time of their appointment? In that case, the report is void. You must inform the judge through your lawyer, who can request a new report.
3. What are the time limits for challenging a criminal expert report? The challenge must be raised before the close of the investigation. After that deadline, it is inadmissible.
4. Can an honorary expert be appointed? No. Article 157 requires registration as an active expert. But if appointed by mistake, the report is void.
5. Does this rule apply to civil expert reports? No, the regime is different. In civil matters, the expert must be registered at the time of their appointment and remain so throughout their assignment, on pain of nullity.

In summary, the 1986 decision of the Court of Cassation protects you against abusive challenges based on the late removal of the expert. However, it does not dispense you from verifying that the expert was registered at the time of their appointment. If in doubt, do not hesitate to consult a specialist lawyer.

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