Police Custody and Nullity: When the Public Prosecutor is Not an Independent Judicial Authority

Imagine: you own a house in Biscarrosse, and a neighbourhood conflict escalates into a criminal complaint. You are taken into police custody for minor assault. After 24 hours, the public prosecutor authorises the extension of your custody. You wonder: is this extension lawful? More still: is the prosecutor truly independent to make such a decision? The question is crucial, because if the answer is no, the entire procedure may be annulled.

This decision of the Court of Cassation of 15 December 2010 (No. 10-83.674) answers in the negative: the magistrate of the public prosecutor's office – the prosecutor – is not a judicial authority within the meaning of Article 5 § 3 of the European Convention on Human Rights (ECHR). In plain terms, he does not have the required guarantees of independence and impartiality, because he is also the prosecuting party. In other words, it is a bit as if the complainant alone decided on your detention.

But what does this change for you, as an owner in Capbreton or a tenant in Mont-de-Marsan? Much more than one might think. In criminal proceedings related to a property dispute – for example, a verbal assault during a seasonal rental – the validity of the police custody determines the admissibility of evidence. If the custody is null, the confessions or findings may be excluded. Let us decipher this decision and its practical implications together.

The Facts: A Story Like Many Others

Mr. X, an owner in Biscarrosse, is implicated in an assault case. He is taken into police custody. After the first 24 hours, the public prosecutor authorises the extension of this measure for an additional 24 hours. Mr. X challenges this extension before the investigating chamber, arguing that the prosecutor is not an independent and impartial judicial authority within the meaning of the European Convention on Human Rights. According to him, the extension is therefore void, as are all subsequent acts (hearings, confrontations, etc.).

The investigating chamber rejects his application, considering that the prosecutor does meet the conditions. Mr. X appeals to the Court of Cassation. The Court of Cassation, in its judgment of 15 December 2010, quashes the decision of the investigating chamber. It recalls that, according to the settled case law of the European Court of Human Rights (ECtHR), the magistrate of the public prosecutor's office does not have the guarantees of independence and impartiality required by Article 5 § 3 of the ECHR. Indeed, the prosecutor is the prosecuting party: his mission is to seek the application of criminal law, which makes him partial. Consequently, the extension of police custody by the prosecutor is irregular.

What few people know is that this decision is not limited to police custody. It calls into question the role of the prosecutor in all measures depriving liberty that he may order, particularly in matters of administrative detention or psychiatric care. For our owner in Biscarrosse, the consequence is immediate: the entire criminal proceedings against him could be annulled for lack of legal basis for the extension of his custody.

The Reasoning of the Court — Explained

The Court of Cassation relies on Article 5 § 3 of the European Convention on Human Rights, which provides that everyone arrested or detained shall be brought promptly before a judge or other officer authorised by law to exercise judicial power. The key term is judge: an impartial and independent authority, not a party to the proceedings. However, the public prosecutor is the head of the prosecution. In our system, he directs the investigation, requests measures, and supports the prosecution. Therefore, he cannot be considered an impartial third party.

The decision also cites the case law of the ECtHR, notably the judgments Moulin v. France (2008) and Medvedyev and Others v. France (2010), which had already held that the French prosecutor did not meet the independence requirements. The Court of Cassation draws the consequences: any police custody extended by the prosecutor is tainted with nullity. However, note: the nullity does not affect the initial custody (the first 24 hours, which are under the control of a judicial police officer), but only the extension.

The arguments of Mr. X's defence were therefore based on this European case law. The investigating chamber had dismissed his application on the ground that the prosecutor was a judicial authority. The Court of Cassation corrects this error: the plea is admissible and well-founded. undefined that lawyers can now invoke this decision to seek the annulment of all proceedings subsequent to the irregular extension.

What This Changes for You — Practically

Landlord owner: If you are involved in criminal proceedings following a tenancy dispute (for example, assault during a check-in/out inventory), your police custody may be extended by the prosecutor. If so, you can challenge this extension and, if it is annulled, evidence gathered after the 24th hour (such as your statements) could be excluded. This may weaken the prosecution. Example in Capbreton: an owner is prosecuted for threatening a tenant. His custody is extended by the prosecutor. Thanks to this case law, his lawyer obtains the annulment of the extension, and the case is closed for lack of sufficient evidence.

Tenant: If you are a victim of an assault by your landlord, the criminal proceedings may be weakened if the landlord's custody is annulled. This may prompt you to act quickly and seek protective measures (such as a protection order) before the proceedings are compromised.

Purchaser or co-owner: In the context of a sale or co-ownership, a dispute may escalate into a criminal complaint (fraud, breach of trust). The same logic applies: if a police custody is extended by the prosecutor, the defence can challenge its validity. If you are accused, you must immediately verify the conditions of your custody.

In short, this decision strengthens the rights of persons in police custody. It requires that any extension be authorised by an investigating judge or a judge of liberties and detention (JLD), and not by the prosecutor. undefined, I have encountered cases where owners in Mont-de-Marsan were able to have abusive criminal proceedings annulled thanks to this argument.

Four Tips to Avoid This Type of Dispute

• Tip 1: Document all conflicting exchanges. In the event of a property dispute, keep written records (emails, texts, photos). This can prevent escalation to a criminal complaint and custody.
• Tip 2: In case of custody, demand a lawyer from the outset. The lawyer can immediately verify the conditions of the extension and challenge any irregularity.
• Tip 3: Do not sign anything without understanding. During custody, you may be asked to sign reports. If you doubt the regularity of the procedure, refuse to sign and ask your lawyer.
• Tip 4: If you are an owner, take out legal protection insurance. It will cover legal fees in criminal proceedings and allow you to effectively challenge any irregularity.

Further Reading: Related Case Law and Developments

Before this decision, the Court of Cassation considered that the prosecutor was a judicial authority within the meaning of Article 5 § 3 (Crim., 4 May 2004, No. 03-87.877). This reversal in 2010 is therefore significant. It follows France's condemnation by the ECtHR in Moulin v. France (2008), where the European Court had held that the prosecutor lacked independence. Since 2010, the case law has been consolidated: the law of 15 June 2000 created the judge of liberties and detention (JLD), who is now the competent authority to extend police custody beyond 48 hours (for serious offences). However, for extensions to 24 hours, the prosecutor remains competent in certain cases (notably for drugs or terrorism). The 2010 decision therefore had a limited practical impact, but it remains a powerful argument to challenge irregular custody.

In 2011, the Court of Cassation clarified that this nullity could only be invoked if the person had been deprived of the opportunity to challenge the extension (Crim., 15 March 2011, No. 10-88.478). This means that the lawyer must act quickly.

What You Absolutely Must Remember

1. The prosecutor is not an impartial judge. Therefore, he cannot alone authorise the extension of police custody beyond 24 hours, except for legal exceptions.
2. If your custody was extended by the prosecutor, you can seek the annulment of all subsequent proceedings. This includes hearings, searches, etc.
3. Act quickly: the nullity must be raised before any defence on the merits, otherwise it is forfeited.
4. Do not neglect the European dimension. The ECHR takes precedence over domestic law, and its judgments are directly invocable before French courts.

Are you in a similar situation? A first 30-minute consultation with Maître Zakine (€45) can save you months of proceedings – and often much more. Book an appointment →