French Evidence Law

Overview

French evidence law (droit de la preuve) exhibits a fundamental dichotomy between criminal and civil procedure, reflecting the different values at stake in each context. In criminal matters, the principle of freedom of evidence (liberté de la preuve) prevails, subject to procedural guarantees derived from the European Convention on Human Rights. In civil matters, a more structured system governs, characterized by a hierarchy of evidence with a preference for written proof. The codification of civil evidence law was significantly reformed by Ordinance No. 2016-131 of 10 February 2016, which modernized the law of obligations and reorganized the evidentiary provisions in the Civil Code at Articles 1353–1386-9.

The Principle of Freedom of Evidence in Criminal Matters

Article 427 of the Code of Criminal Procedure (Code de procédure pénale, CPP) establishes the fundamental principle that criminal judges may decide on the basis of any evidence presented to them according to their intimate conviction (intime conviction). This principle of free admissibility means that the type of evidence — whether witness testimony, expert reports, documentary evidence, or any other form — does not determine its admissibility. The judge is free to consider all evidence regardless of its formal characteristics, subject to the requirements of lawful procurement and procedural regularity.

The standard of proof in criminal proceedings is intime conviction — the judge must be personally and deeply convinced of the accused’s guilt. Unlike the common law’s “beyond a reasonable doubt” formulation, the French standard is expressed positively: the judge must possess an inner certainty. The Cour de cassation supervises compliance not by reviewing the weight of the evidence but by ensuring that the lower courts provide a reasoned judgment (motivation) demonstrating that they have formed their conviction on the basis of legally obtained evidence.

The Presumption of Innocence and Procedural Guarantees

The presumption of innocence is constitutionally protected under Article 9 of the Declaration of the Rights of Man and of the Citizen of 1789 and is codified in Article préliminaire of the Code of Criminal Procedure. The right to silence (droit de se taire) was formally recognized in French law following the 2011 reform implemented through Law No. 2011-392 of 14 April 2011, which transposed Directive 2012/13/EU and Directive 2013/48/EU. The garde à vue (police custody) regime requires that suspects be informed of their right to remain silent, the right to counsel, and the right to have a third party notified of their detention.

Evidence obtained through torture, inhuman or degrading treatment, or in violation of the right to a fair trial under Article 6 ECHR is excluded. The Cour de cassation has held that evidence obtained through police misconduct — including the provocation of an offence by an agent provocateur — violates the right to a fair trial and must be excluded from the proceedings. The burden of proof in criminal matters rests entirely on the prosecution (ministère public), and any doubt must benefit the accused.

The Investigating Judge and the Collection of Evidence

In serious criminal cases (crimes and certain délits), the investigation is conducted by an investigating judge (juge d’instruction), an independent magistrate responsible for gathering evidence for both the prosecution and the defence. The investigating judge conducts interviews, commissions expert reports, orders searches and seizures, and may authorize the interception of telecommunications under Articles 100–100-7 CPP. The reform of 15 June 2000 strengthened the rights of the defence during the investigation by creating the juge des libertés et de la détention (judge of liberties and detention) to authorize prolonged custody and by enhancing defence access to the case file. The investigating judge operates under the principle of contradictoire — the requirement that both parties have the opportunity to challenge evidence.

Civil Evidence Law Under the Civil Code

The law of civil evidence was reorganized by the 2016 reform and is now contained in Articles 1353–1386-9 of the Civil Code. Article 1353 restates the fundamental rule that the burden of proof lies with the party asserting a claim (actori incumbit probatio). The defendant bears the burden of proving any affirmative defence. Article 1354 provides that presumptions of law may shift the burden of proof.

The Hierarchy of Evidence in Civil Matters

French civil law historically maintained a strict hierarchy of evidence, privileging written proof over oral testimony. Prior to the 2016 reform, Article 1341 of the Civil Code required written proof for all legal acts involving a value exceeding €1,500 (formerly 5,000 French francs). This requirement reflected the concern that oral testimony is unreliable and that written evidence provides greater security in commercial and civil transactions.

The 2016 reform modified this framework while maintaining the general preference for written evidence. Article 1359 retains the requirement that any juridical act (acte juridique) — a voluntary legal transaction such as a contract, will, or gift — involving a value exceeding €1,500 must be proven by written evidence. However, Article 1359(2) provides several exceptions: (1) where it was impossible for the party to obtain written proof (moral impossibility, such as between close relatives, or material impossibility, such as force majeure); (2) where the party has lost the written instrument through force majeure; (3) in commercial matters, where the rules are more flexible and oral evidence is generally admissible; and (4) where the parties have agreed to dispense with writing.

Types of Written Evidence

French law distinguishes between two categories of written evidence. Acte authentique (Article 1368–1371) is a document executed before a public officer — typically a notary (notaire) or a registrar — who has the authority to authenticate it. The acte authentique carries full probative force (force probante) as to the facts that the officer certifies having personally observed. It may be challenged only through a procedure of inscription de faux (allegation of forgery), which is difficult and carries sanctions for bad faith.

Acte sous seing privé (Article 1372–1377) is a private writing executed by the parties without the involvement of a public officer. It is binding between the parties but does not carry the same presumption of authenticity as an acte authentique. The party disputing a private writing bears the burden of proving forgery or invalidity.

Casual Evidence and Other Means of Proof

Outside the requirement for written proof of juridical acts, French law recognizes several forms of casual evidence (preuve occasionnelle). Witness testimony (témoignage), governed by Articles 199–230 of the Code of Civil Procedure, is admissible in civil proceedings where written proof is not required or where there is a commencement of written proof (commencement de preuve par écrit) — a written document that makes the alleged facts plausible. The court evaluates witness testimony freely but must provide reasons for its assessment.

Presumptions (présomptions), under Articles 1382–1383, are legal or factual inferences that the court may draw from known facts. Legal presumptions (présomptions légales) are established by statute and may be either absolute (irréfragables) — admitting no contrary proof — or simple (simples) — shifting the burden of proof to the opposing party.

Admissions (aveu), under Articles 1383-9 to 1383-12, are statements by a party acknowledging a fact adverse to that party’s interest. Judicial admissions (aveu judiciaire), made in the course of proceedings, have full probative force and bind the party making them. Extrajudicial admissions (aveu extrajudiciaire) are assessed freely by the court.

The oath (serment), under Articles 1384–1386-9, is a solemn assertion by a party that may be decisory (décisoire), where the party to whom the oath is offered must either swear or lose the case, or suppletory (supplétoire), where the court orders a party to swear to supplement incomplete proof.

Expert Investigation and Other Evidentiary Procedures

French civil procedure provides for specific evidentiary measures under the supervision of the court. Expert investigation (expertise), governed by Articles 263–284 of the Code of Civil Procedure, involves the appointment of a court-ordered expert to examine facts requiring technical or scientific assessment. The expert operates under the principle of contradictoire, providing a detailed report that the parties may contest. The court is not bound by the expert’s conclusions but must give reasons for rejecting them.

The on-site visit (descente sur les lieux), governed by Articles 179–183, permits the judge to personally examine a location or object relevant to the dispute. Witness hearings (enquête), under Articles 199–230, involve the formal examination of witnesses, typically conducted by the judge who questions witnesses based on the issues identified by the parties. All evidentiary procedures in French civil law are governed by the fundamental principle of contradictoire — the requirement that each party have the opportunity to know and challenge the evidence presented by the opposing party.