You are British, you live in France or you are visiting, and blue lights are flashing in your mirror — or officers are knocking at your door at dawn. Since Brexit you are a third-country national in France, and a brush with the police raises questions your French neighbours never ask: will the consulate be told, will an interpreter be provided, can you be thrown out of the country, and who do you call when your French deserts you? Here is the short answer. France may hold you in garde à vue — police custody — for up to twenty-four hours, renewable once, but only under the supervision of a prosecutor, only on defined grounds, and only after notifying you, in a language you understand, of rights that include a lawyer, a doctor, an interpreter, and contact with your family, your employer and the British consulate. Most detentions end with release, but the hours in custody shape everything that follows: what you said, whether your lawyer was there, and whether the custody itself was lawful. This guide walks through the stop, the cell, the prosecutor’s decision and the remedies, with the exact statutes and two recent rulings of the Court of Cassation — France’s supreme court for criminal matters.

I. In French police hands: custody, the free hearing and the first hours that decide everything

A. Custody or free hearing: why the label matters and what to say first

French police have two ways of questioning a suspect, and the difference decides whether you may walk out of the door. The lightest is the audition libre, the free hearing: you are heard as a suspect but you are not detained. Article 61-1 of the Code of Criminal Procedure requires officers to tell you, before any free hearing, of “Du droit de quitter à tout moment les locaux où elle est entendue” — your right to leave the premises at any moment. You must also be told what offence you are suspected of, that you may be assisted by an interpreter where appropriate, and that you enjoy “Du droit de faire des déclarations, de répondre aux questions qui lui sont posées ou de se taire” — the right to make statements, to answer questions, or to remain silent. If officers invite you “to come and clarify a few points” at the commissariat (the town police station) or the gendarmerie (the military-status police force covering smaller towns and rural areas), ask plainly whether you are heard freely and whether you may leave. If the answer is yes, you are in a free hearing; if it is no, you are almost certainly moving into custody.

Custody — the garde à vue — is, as the official public-service guide explains, a deprivation of liberty ordered during a criminal investigation against a person suspected of an offence (service-public.fr, rules of police custody). The statute sets a high threshold. Article 62-2 of the Code of Criminal Procedure states: “La garde à vue est une mesure de contrainte décidée par un officier de police judiciaire, sous le contrôle de l’autorité judiciaire, par laquelle une personne à l’encontre de laquelle il existe une ou plusieurs raisons plausibles de soupçonner qu’elle a commis ou tenté de commettre un crime ou un délit puni d’une peine d’emprisonnement est maintenue à la disposition des enquêteurs.” Only an officier de police judiciaire — a judicial police officer, a senior investigator with statutory powers — may order it, and only where there are plausible reasons to suspect a crime or an imprisonable offence. It must, the same article continues, “constituer l’unique moyen de parvenir à l’un au moins des objectifs suivants”: it must be the only way of achieving at least one of six listed aims, from carrying out investigations that need your presence, to bringing you before the prosecutor, preserving evidence, preventing pressure on witnesses, preventing collusion with accomplices, or stopping the offence. Custody applies whether the investigation is a flagrance enquiry — caught in the act or hot on the trail — or a preliminary enquiry, since Article 77 of the Code of Criminal Procedure makes the custody rules applicable to preliminary enquiries too. A roadside drink-driving control that turns positive, a shoplifting allegation at a supermarket, a fight after a rugby match, a fraud complaint from a former business partner: all can lead to the same cell if the officer considers your presence indispensable.

What you do in the first minutes matters more than anything you will do later. First, do not resist, flee or push an officer: resistance and rebellion are standalone imprisonable offences in France and will convert a manageable file into a serious one. Second, identify yourself and prove your right to be in France — passport, carte de séjour (residence permit), or Withdrawal Agreement card — but say nothing about the facts until you have understood your status and spoken to a lawyer. Third, if your French is hesitant, state immediately, in English if necessary, that you need an interpreter; the right exists from the first notification, as the next section shows, and everything notified to you must be in a language you understand. Fourth, memorise or write down exact times: when you were stopped, when you arrived at the station, when your rights were read, when you asked for a lawyer, a doctor or the consulate, and when each arrived. French custody runs on the clock, and a missing hour can later annul the whole measure. Readers stopped at the wheel should also know the companion procedure for licences: our guide to exchanging a UK driving licence in France and challenging a refusal explains which British licences France still recognises — useful context when a roadside check escalates. Finally, use your one monitored telephone call wisely: a relative who can contact a lawyer beats a long worried conversation with no practical outcome.

B. Your rights in the cell: interpreter, lawyer, doctor, family and the British consulate

The moment custody begins, the officer must read you your rights — not in rapid French while you nod, but in a language you understand. Article 63-1 of the Code of Criminal Procedure provides: “La personne placée en garde à vue est immédiatement informée par un officier de police judiciaire ou, sous le contrôle de celui-ci, par un agent de police judiciaire, dans une langue qu’elle comprend” — the person placed in custody is immediately informed, in a language she understands, if necessary using a standard written form. That notification must cover the placement itself and its possible duration and extensions, the suspected offence with its date, place and the legal grounds, and then the catalogue of rights: “du droit d’être assistée par un avocat, conformément aux articles 63-3-1 à 63-4-3”; “si elle est de nationalité étrangère, les autorités consulaires de l’Etat dont elle est ressortissante” — for a foreign national, the consular authorities of her state; “s’il y a lieu, du droit d’être assistée par un interprète” — where applicable, the right to be assisted by an interpreter; plus the doctor, access to the file, and the right to make observations to the prosecutor on any extension. If you were notified only in French that you did not follow, say so on the record and refuse to sign any statement that you understood: the procès-verbal — the official written record — of notification is the first document your lawyer will attack.

The interpreter is the key that unlocks every other right. Without one, the notification is theatre, the interview is a trap, and any signature is suspect. French law gives you an interpreter for the notification, for every interview, and for meetings with your lawyer where needed; insist on it from the first minute and at each new stage, and check that the record mentions the interpreter’s presence and the language used. A British detainee who answers in approximate French “to be helpful” often discovers at trial that an ambiguous phrase was written up as a confession. Silence plus interpreter is not rudeness; it is method.

The lawyer is the second key, and French law now gives that key real teeth. Article 63-3-1 of the Code of Criminal Procedure lets you ask, from the start of custody and at any point, to be assisted by a lawyer of your choice or one appointed by the president of the Bar (commis d’office). Article 63-4 of the Code of Criminal Procedure gives that lawyer a confidential thirty-minute interview with you, renewable if custody is extended. Crucially, Article 63-4-2 of the Code of Criminal Procedure adds: “La personne gardée à vue peut demander que l’avocat assiste à ses auditions et confrontations.” You may demand that your lawyer sit beside you in every interview and confrontation, and without your express recorded waiver you cannot be questioned on the facts in the lawyer’s absence. Your lawyer may also consult the custody notification record, the medical certificate and the records of your interviews under Article 63-4-1 of the Code of Criminal Procedure. Ask for the duty lawyer immediately even if you intend to appoint your own later: the first interview often happens within hours, and an empty chair cannot be reconstructed afterwards. If you qualify, French aide juridictionnelle — state legal aid — can cover the cost; ask the officer or the lawyer how to apply rather than assuming you must pay.

Two further rights protect your body and your links to the outside world. Article 63-3 of the Code of Criminal Procedure states: “Toute personne placée en garde à vue peut, à sa demande, être examinée par un médecin désigné par le procureur de la République ou l’officier de police judiciaire.” Ask for the examination systematically: it certifies fitness for continued custody, records injuries or illness, and secures medication, and a second examination is available on extension. As for the outside world, Article 63-2 of the Code of Criminal Procedure lets you have a close person, your employer and — decisive for a Briton — the consulate informed: “Lorsque la personne gardée à vue est de nationalité étrangère, elle peut faire contacter les autorités consulaires de son pays.” Use all three channels: a relative to organise your defence and feed the cat, the employer to explain an unexplained absence before it becomes a dismissal, and the consulate for the specific help London offers.

That consular help is real but narrowly bounded, and the British government’s own prisoner pack for France warns that consular staff do what they can to help but cannot interfere with the local justice system, cannot secure release, and cannot pay for services such as a lawyer (gov.uk, information pack for British nationals arrested or detained in France). What consular staff can do is visit or contact you, inform your family if you wish, provide lists of English-speaking lawyers and interpreters, explain how the French system differs from the English one, and monitor welfare and medical care. They cannot secure your release, translate documents, or fund your defence. So when custody notifies the consulate at your request, expect a welfare visit and practical lists — welcome, but not a substitute for the French lawyer sitting next to you in the interview room.

Custody is also a stopwatch. Article 63 of the Code of Criminal Procedure is categorical: “La durée de la garde à vue ne peut excéder vingt-quatre heures.” One extension of up to twenty-four more hours is possible, but only on the written, reasoned authorisation of the procureur de la République — the public prosecutor, the magistrate who directs the investigation — only for a crime or an offence carrying at least one year of imprisonment, and only where the extension is the sole way of achieving the statutory aims. Time spent under constraint for the same facts before custody counts toward the clock, and Article 64 of the Code of Criminal Procedure forces the officer to record everything: “L’officier de police judiciaire établit un procès-verbal mentionnant”, including “Les informations données et les demandes faites en application des articles 63-2 à 63-3-1 et les suites qui leur ont été données” — the information given, the requests you made under Articles 63-2 to 63-3-1, and what became of them — with your countersignature on the essential entries. Read before you sign, have the interpreter re-read, and add anything missing in your own hand, for example the hour you asked for the doctor and the hour the doctor actually arrived That sentence may be worth more than a day of argument later.

II. After the cell door opens: answering the charge and challenging an irregular custody

A. Release, summons or immediate trial: the prosecutor’s options and your next move

When the clock runs out, four doors open. The first is simple release with no further action — the classement sans suite, the prosecutor’s decision to close the file. It happens more often than frightened detainees believe, particularly where the evidence is thin or the complaint collapses. Keep the release slip and note the file number; a closed file can be reopened if new evidence appears, and the paper proves the dates. The second door is release with a summons: a convocation par officier de police judiciaire (a summons to appear delivered by the police), a convocation en justice, or a formal summons to a later hearing. Treat that paper as the most important document you own: it states the court, the date and the charges, and missing the date can mean trial and conviction in your absence. The third door is the fast track — comparution immédiate, immediate trial, where you are brought before the criminal court within days for straightforward cases with solid evidence. The fourth is the comparution sur reconnaissance préalable de culpabilité, the French guilty-plea procedure: the prosecutor proposes a sentence, you accept or refuse it in the presence of your lawyer, and the court homologates or rejects the deal. Alongside these sit alternatives to prosecution for minor matters — reminders of the law, mediation, or a fixed fine — which leave a lighter trace but still require a lawyer’s eye before you sign anything.

Whatever the door, the same reflexes apply. First, say nothing substantive about the facts until your lawyer has seen the file: the custody interviews are already in it, and contradicting them without preparation helps nobody. Second, gather proof of who you are in France, because the court’s view of you shapes bail, adjournments and sentence: residence permit or Withdrawal Agreement card, employment contract or business registration, payslips, lease or title deeds, children’s school certificates, and evidence of integration such as tax notices. A settled British resident with a job in Lyon is not judged like a passing stranger, but only if the file shows it. Third, never ignore a summons because you have returned to the United Kingdom: French courts can try you in your absence, issue a warrant, and enter a conviction that surfaces at every future border check. If you must travel, tell your lawyer, elect an address for service in France, and arrange representation. Fourth, for road-traffic cases — the commonest British encounter with French custody — preserve the technical defences early: the time of the breath or blood test, the device used, whether a confirmatory test was offered, and whether your UK licence was valid and recognised on that date. Memories fade; the custody record does not.

Language rights do not stop at the police station door. At trial you are entitled to an interpreter free of charge, to the translation of essential documents, and to a lawyer — appointed where necessary. Ask the court registry (greffe) in writing for an English interpreter well before the hearing rather than hoping one appears on the day. If you change address, notify the court and your lawyer the same week: French procedural mail goes to the last known address, and “I never received the summons” rarely survives the file showing due dispatch. And keep every paper from the custody — notification record, medical certificate, release slip, summons — in one folder with a timeline. Your future lawyer will reconstruct the whole case from that folder in an hour; without it, the reconstruction takes weeks and misses things.

One warning specific to Britons: do not assume the English and French systems mirror each other. France has an investigating judge (juge d’instruction) for serious cases, a dossier-based procedure where the written file dominates, and limited pre-trial disclosure to the suspect personally — your lawyer consults the file, you do not browse it. Silence at trial cannot be held against you as it once could in England and Wales, but refusing every explanation while the file overflows with evidence is a tactic, not a reflex, and it belongs to your lawyer. Above all, do not telephone victims, witnesses or co-suspects “to sort it out”: contact in breach of judicial supervision (contrôle judiciaire) conditions is the fastest route from liberty back to a cell, and witness interference is itself an offence.

B. Getting an unlawful custody thrown out and protecting your life in France

An irregular custody is not a moral complaint; it is a legal weapon. French courts annul custody measures — and with them the interviews conducted inside — where the safeguards were breached and the defence suffered. Two recent rulings of the Court of Cassation show how concretely judges examine the cell’s paperwork. In the first, the criminal chamber quashed proceedings after officers failed to secure a suspect the effective assistance of counsel from the outset. The Court recalled the governing principle in terms every detainee should know: the notification rules exist to guarantee “l’assistance effective du mineur gardé à vue par un avocat, ainsi que le libre choix de l’avocat qui prodiguera cette assistance”, adding that “Cette information est prévue dans l’intérêt du mineur placé en garde à vue et son absence entraîne la nullité du placement en garde à vue” (Court of Cassation, Criminal Chamber, 16 October 2019, no. 19-81.084, published in the Bulletin). The case concerned a minor, for whom the protection is at its highest, but the reasoning displays the general method: assistance of counsel is effectiveness plus free choice, and failure on either front means nullity. For an adult Briton the translation is direct — a lawyer never called, a chosen lawyer never notified, or interviews conducted without the lawyer you demanded all belong in a nullity application.

The second ruling, handed down in 2025, completes the picture from the police’s side of the desk. Officers had in fact arranged the chosen lawyer’s attendance at each interview, but the custody records noted none of the steps taken to notify that lawyer. The trial judges annulled the custody, reasoning that defence rights had been breached and that the suspect had lost the chance to build a strategy with counsel, since “la présence d’un avocat en garde à vue ne se limitant pas à l’assistance de la personne gardée à vue lors des auditions, mais lui permettant également de s’assurer du bon déroulement de la mesure et d’apporter son soutien à la personne qui en fait l’objet”. The Court of Cassation quashed that annulment — but on a ground that helps future detainees understand the rule rather than weakening it: “l’officier de police judiciaire établit un procès-verbal récapitulatif de fin de garde à vue mentionnant les informations données et les demandes faites en application des articles 63-2 à 63-3-1 du code de procédure pénale et les suites qui leur ont été réservées, sans qu’il soit nécessaire de dresser un procès-verbal pour chacune des diligences accomplies pour l’exercice de ces droits” (Court of Cassation, Criminal Chamber, 6 May 2025, no. 24-86.191, published in the Bulletin). In other words, a single end-of-custody summary record may suffice — provided it genuinely recounts the steps taken and their outcome. The practical lesson for a British detainee is therefore precise: make requests that leave traces, check that the summary record reflects them, and where it does not, your lawyer has the raw material for annulment. Late notification of rights, no interpreter, a chosen lawyer never contacted, interviews without counsel, missing time entries, absent countersignatures: each is pleaded before the trial court or, during investigation, the investigating chamber, through a written application identifying the breach, the text violated and the resulting prejudice.

Beyond the criminal file itself, a Briton must protect residence, work and family. Custody alone changes nothing about your right to stay: it is a measure, not a conviction, and it creates no duty to inform the prefecture. Conviction is a different matter. Serious offences can carry, alongside prison or fines, a ban from French territory, and any sentence may complicate renewals of residence permits, applications for French nationality and cross-border travel. The defence therefore starts in the criminal court with one eye on the prefecture: keep your permit valid throughout the proceedings, keep proof of continuous residence and integration current, and take specialist advice before accepting any fast-track procedure whose foreigner-specific consequences you have not measured. Tell your employer promptly and in writing where absence rules require it — an unexplained disappearance is a disciplinary file waiting to happen — and if you share custody of children, arrange care before the first hearing rather than improvising on the day. Finally, remember that a French conviction is in principle enforceable and visible across the European Union’s criminal-record exchange systems and may be asked about on job, visa and insurance forms for years; challenging the custody that produced the evidence is often the earliest moment to contain that long tail.

Conclusion

French police custody compresses your entire defence into a few hours: the words you say, the lawyer you call, the interpreter you demand and the times you note. For a British citizen the system is navigable — notification in a language you understand, counsel at your interviews, a doctor, contact with your family and the consulate, and a strict twenty-four-hour clock under a prosecutor’s control — but none of it works on autopilot. Ask for the interpreter before you answer, for the lawyer before you explain, for the doctor before you ache, and for the consulate before rumour reaches your family first. Then keep every paper, meet every summons, and have the custody’s legality tested by counsel the moment the file reaches a court. Most detentions end at the station door; those that do not are won or lost on what happened inside the cell.