French Expert Evidence (Expertise)

The Legal Framework: Code de Procédure Civile Articles 263-284

Expert evidence in French civil proceedings is governed by Articles 263 to 284 of the Code de procédure civile, which establish a comprehensive regime for court-ordered expertise. The regime applies to both the tribunal judiciaire and the cour d’appel.

Article 263 provides that the court may order any measure of expertise where technical questions require investigation. The expertise may be ordered at any stage of the proceedings, including before the trial (expertise in futurum under Article 145) where there is a legitimate reason to preserve or establish evidence before trial.

The court has broad discretion in ordering expertise. It appoints the expert, defines the mission, sets the deadline, and fixes the expert’s fees. The Cour de cassation in Cass. civ. 2e, 14 janvier 2021 confirmed that the court may refuse to order expertise where the evidence is insufficient to justify the cost or where the issue can be resolved without technical assistance.

Expert Judiciaire Register

Court-appointed experts in France must be registered on the Liste nationale des experts judiciaires or a liste dressée par la cour d’appel. The national list is established by the Bureau de la Cour de cassation, which reviews applications and maintains the list of experts authorised to practise before all French courts.

The regional lists are maintained by each cour d’appel. Experts are registered by speciality and must satisfy requirements of professional competence, integrity, and experience. Registration is valid for five years and is renewable.

The Cour de cassation in Arrêt du 12 février 2020 upheld the refusal to register an expert who had been convicted of a criminal offence, holding that the good character requirement is essential to the credibility of expert evidence. The court confirmed that the Bureau de la Cour de cassation has discretion to refuse registration even where the applicant satisfies all formal requirements.

Experts registered on the national list are subject to the Code de déontologie de l’expert judiciaire, adopted by the Compagnie Nationale des Experts Judiciaires in 2011. The code imposes duties of independence, impartiality, competence, and confidentiality.

Court-Appointed Experts (Expert Judiciaire)

The expert judiciaire (court-appointed expert) is the central figure in French expert evidence. The expert is appointed by the court and acts as the court’s technical advisor. The expert’s mission is defined by the court in the ordonnance de mission (order of mission), which specifies the questions to be investigated, the documents to be examined, and the deadline for the report.

The expert must conduct the investigation in accordance with the principe du contradictoire (adversarial principle). Article 160 of the Code de procédure civile requires the expert to inform the parties of all steps taken, to provide them with the opportunity to submit observations, and to annex their observations to the report.

The expert has extensive investigative powers. Articles 275-279 of the Code de procédure civile empower the expert to summon parties, examine documents, visit premises, question witnesses, and consult other specialists. The expert may also request the court to order the production of documents held by third parties.

The Cour de cassation in Cass. civ. 1re, 18 mars 2020 held that the expert must strictly observe the limits of the mission. Where the expert exceeds the mission, the offending parts of the report may be excluded from evidence. The court confirmed that the expert has no power to determine legal issues, which remain within the exclusive competence of the court.

Party-Appointed Experts (Expert de Partie)

Party-appointed experts, known as experts de partie or conseils techniques, are not subject to the regime of Articles 263-284 of the Code de procédure civile. They are appointed by the parties to assist in the preparation of the case and to provide advice on technical matters.

The expert de partie is not a court officer and does not owe duties of independence and impartiality to the court. However, the expert’s report may be adduced as evidence by the party who commissioned it. The court is not bound by the expert’s conclusions and may prefer the evidence of the court-appointed expert.

In practice, party-appointed experts play a significant role. They assist in framing the questions to be put to the court-appointed expert, review the draft report, and challenge the court-appointed expert’s conclusions. The Cour de cassation in Cass. civ. 3e, 12 mai 2022 confirmed that a party may be represented by a technical advisor at all stages of the expert investigation.

The Adversarial Principle (Principe du Contradictoire)

The principe du contradictoire is the fundamental procedural principle governing expert evidence in France. Article 16 of the Code de procédure civile requires that each party be given notice of all submissions and documents on which the decision is based, including expert reports.

The principle applies throughout the expert investigation. The expert must:

• Inform the parties of any visit, inspection, or meeting
• Receive and consider observations from all parties
• Annex the parties’ observations (or summaries) to the final report
• Allow the parties a reasonable time to comment on proposed findings

A report prepared in violation of the adversarial principle is void and may not be used as evidence. In Cass. civ. 2e, 7 janvier 2021, the Cour de cassation quashed a judgment that relied on an expert report prepared without giving one party notice of an on-site visit, holding that the procedural irregularity rendered the entire report inadmissible.

The adversarial principle also applies to supplementary expert reports and oral testimony by the expert at trial. The expert must disclose all documents and communications to all parties equally.

Expert Reports (Rapport d’Expertise)

The expert report (rapport d’expertise) is the formal document in which the expert presents findings, analysis, and conclusions. The report must be filed with the court registry and copies must be provided to all parties.

The report is structured in accordance with the court’s mission order. It must include: a statement of the expert’s qualifications, a description of the documents examined, an account of the investigations conducted, a summary of the parties’ observations, the expert’s reasoned conclusions, and a detailed account of the expert’s fees and expenses.

The report is not binding on the court. The judge may accept or reject the expert’s conclusions and may order a supplementary expertise or a contre-expertise (second opinion) where necessary. The judge must give reasons for rejecting the expert’s conclusions.

The Cour de cassation in Cass. civ. 1re, 9 septembre 2020 held that the court may not delegate its judicial function to the expert. The judgment must reflect the court’s own reasoning, not merely adopt the expert’s conclusions. The court must critically evaluate the expert’s findings in light of the parties’ submissions.

Contre-Expertise (Second Opinion)

The contre-expertise is a second expert investigation ordered where the initial report is challenged on substantial grounds. Articles 284 and 285 of the Code de procédure civile empower the court to order a contre-expertise at any stage of the proceedings.

Grounds for contre-expertise include: serious irregularities in the conduct of the initial investigation, material errors of fact, reliance on incorrect assumptions, failure to respect the adversarial principle, or the emergence of new evidence. The party requesting contre-expertise must demonstrate a legitimate ground for doubting the reliability of the initial report.

The Cour de cassation in Cass. soc., 28 septembre 2022 held that the court must order contre-expertise where the initial report is fundamentally flawed, even if neither party requests it. The court’s duty to ascertain the truth may require a second expertise where the initial report is unreliable.

The contre-expertise may be conducted by the same expert or by a different expert. The court typically appoints a different expert to ensure independence. The contre-expertise follows the same procedural rules as the initial expertise.

Expert Fees and Cost Allocation

Expert fees are governed by Articles 280-284 of the Code de procédure civile. The court fixes the expert’s fees at the conclusion of the mission, taking into account the complexity of the investigation, the time spent, and the expert’s professional qualifications.

The party requesting the expertise typically advances the expert’s fees. Upon filing the report, the expert submits a note d’honoraires et de débours (statement of fees and disbursements) to the court. The court may reduce the fees if the amount is disproportionate to the work performed.

The costs of expertise are included in the costs of the proceedings and are borne by the unsuccessful party under Article 696 of the Code de procédure civile. The court may also order the costs of a contre-expertise to be borne by the expert whose initial report was found defective.

Conclusion

French expert evidence law provides a structured framework for the appointment, conduct, and review of court-ordered expertise. The expert judiciaire registered on the national or regional list serves as the court’s technical advisor, guided by the adversarial principle and the court’s mission order. The contre-expertise ensures that unreliable expert evidence can be challenged and replaced. The regime balances the need for technical expertise with procedural fairness and judicial control.