October half-term, a wedding near Bordeaux, a rugby weekend in Paris, dinner at a Dordogne farmhouse: there are a hundred ordinary reasons a British driver ends up behind the wheel in France after a glass or two too many. The trap is that the glass that keeps you legal at home can make you an offender across the Channel. France’s drink-driving limit is well below the one most English drivers grew up with, French police may test you even when you have committed no other offence, and since Brexit you face all of this as a third-country national, with a UK licence in your pocket and French criminal procedure in front of you. This guide explains, entirely from the French statutes and three very recent decisions of the criminal chamber of the Court of Cassation, what the French drink-driving limit is, how roadside tests work, what happens to your licence on the spot, what penalties follow, and how a case can be challenged. Every French term is explained as it appears, and every decisive statement is anchored to the text cited beside it.

Two warnings come first. Criminal law punishes acts, not nationalities, and nothing below decides any individual case: the reading on the evidential device, the custody record (procès-verbal, the written record drawn up by the police), and the exact time of each test will weigh more than any article. Second, this is general information about French law as it stands on 12 October 2026, not advice on any particular file. With that said, here is what every British driver should know before turning the key after drinking in France. Readers who are settling in France should also read our guide to exchanging a UK driving licence on ANTS after Brexit, and drivers caught by a speed camera rather than a breath test should read our analysis of French speeding fines, ANTAI notices and how to contest them on a UK licence.

I. The French Drink-Driving Limit, Roadside Tests and the Licence Taken on the Spot

A. What Is the Drink-Driving Limit in France and How Are Drivers Tested?

The internet question asked a thousand times a month in Britain is “drink driving France limit”, and the answer surprises most English drivers. For an ordinary driver, France punishes driving from 0.50 grams of alcohol per litre of blood, measured as 0.25 milligrams per litre of exhaled breath. The regulatory text states it plainly: driving “sous l’empire d’un état alcoolique” (under the influence of alcohol) is punished as a fourth-class fixed-penalty offence (contravention de la quatrième classe) from “une concentration d’alcool dans le sang égale ou supérieure à 0,50 gramme par litre ou par une concentration d’alcool dans l’air expiré égale ou supérieure à 0,25 milligramme par litre et inférieure aux seuils fixés à l’article L. 234-1, chez les autres conducteurs”, that is, at or above 0.50 grams per litre of blood or 0.25 milligrams per litre of breath, and below the higher criminal thresholds, for ordinary drivers. The full text of article R. 234-1 of the Highway Code is published on Légifrance. For comparison, GOV.UK publishes the current drink-drive limits for England, Wales and Northern Ireland on its drink-drive limit page, and confirms on that same page that the limits in Scotland are different from the rest of the United Kingdom, so a driver used to English roads must recalibrate twice: once for France, and again if the journey continues north of the border.

Two lower thresholds matter for particular drivers. New drivers in their probationary period (permis probatoire, the first years after passing the test), bus and coach drivers, and drivers restricted to vehicles fitted with an alcohol interlock (éthylotest anti-démarrage, a device that prevents the engine starting after drinking) face a limit of 0.20 grams per litre of blood, or 0.10 milligrams per litre of breath. The same article provides that the fourth-class offence covers, for those categories, “une concentration d’alcool dans le sang égale ou supérieure à 0,20 gramme par litre ou par une concentration d’alcool dans l’air expiré égale ou supérieure à 0,10 milligramme par litre”. British families should note the consequence: a seventeen- or eighteen-year-old who has just passed the British test and drives the family car in France during the holidays is judged against the strictest limit, not the ordinary one.

Above 0.80 grams per litre of blood, or 0.40 milligrams per litre of breath, the matter stops being a fixed-penalty matter and becomes a criminal offence (délit), tried in the criminal courts. Article L. 234-1 of the Highway Code provides: “Même en l’absence de tout signe d’ivresse manifeste, le fait de conduire un véhicule sous l’empire d’un état alcoolique caractérisé par une concentration d’alcool dans le sang égale ou supérieure à 0,80 gramme par litre ou par une concentration d’alcool dans l’air expiré égale ou supérieure à 0,40 milligramme par litre est puni de trois ans d’emprisonnement et de 9 000 euros d’amende.” In English: even with no visible sign of drunkenness, driving at or above 0.80 grams per litre of blood or 0.40 milligrams per litre of breath carries up to three years’ imprisonment and a 9,000 euro fine. The full text of article L. 234-1 is published on Légifrance. Between 0.50 and 0.80, the driver faces the fixed-penalty track; at 0.80 and above, the criminal track, with custody, a courtroom and a criminal record at stake.

How the level is measured matters as much as the number. French procedure works in two stages. First comes screening (dépistage), usually a handheld breath device at the roadside. Then, where screening suggests drinking, officers move to evidential verification (vérifications destinées à établir la preuve), on an approved fixed device (éthylomètre) or by blood sample. Article L. 234-4 provides that where screening suggests alcohol, or where the driver refuses screening, or where a physical incapacity certified by a doctor makes screening impossible, the judicial police officers have the evidential verification carried out. And the power to test is strikingly wide: article L. 234-9 allows officers, on the prosecutor’s instructions or on their own initiative, “même en l’absence d’infraction préalable ou d’accident” — even with no prior offence and no accident — to require any driver to undergo screening and verification. The full text of article L. 234-9 is published on Légifrance. A British driver stopped in a routine check near Calais or on the autoroute du soleil can therefore be tested lawfully without having committed any driving fault at all.

One technical point decides many borderline cases: the margin of error. Approved breath devices over-read slightly, so a corrective margin laid down by the ministerial order of 9 July 2003 must be subtracted before comparing the reading with the legal threshold. On 4 March 2025 the criminal chamber of the Court of Cassation, in decision no. 23-86.419, settled a recurring argument about that margin. A police court had acquitted a driver measured at 0.39 milligrams per litre because the record did not expressly state that the margin had been applied. The Court of Cassation quashed the acquittal, holding that “la mention au procès-verbal que la marge d’erreur a été appliquée au taux retenu n’est pas prescrite à peine de nullité” — the note that the margin was applied is not required on pain of nullity — and that “il appartient au juge, s’il doute de l’application de cette marge d’erreur au taux visé par la prévention, de procéder lui-même à cette opération pour vérifier si le taux relevé est supérieur au minimum prévu par la contravention”: where the judge doubts whether the margin was applied, the judge must do the subtraction personally and check whether the reading still exceeds the minimum. The full decision of 4 March 2025, no. 23-86.419, is published on Légifrance. The practical lesson runs both ways: a missing note about the margin does not automatically kill the case, but in a borderline reading around 0.25 or 0.40 milligrams, asking the court to apply the margin itself can move the figure below the threshold.

B. Can the French Police Keep Your UK Licence at the Roadside?

Yes, immediately, and this is the shock most British drivers remember longest. Where screening and the driver’s behaviour suggest drink-driving at the criminal threshold, or where the approved device confirms it, judicial police officers retain the driving licence on the spot as a precaution (rétention à titre conservatoire). Article L. 224-1 of the Highway Code states: “Les officiers et agents de police judiciaire retiennent à titre conservatoire le permis de conduire du conducteur : 1° Lorsque les épreuves de dépistage de l’imprégnation alcoolique et le comportement du conducteur permettent de présumer que celui-ci conduisait sous l’empire de l’état alcoolique défini à l’article L. 234-1 ou lorsque les mesures faites au moyen de l’appareil homologué mentionné à l’article L. 234-4 ont établi cet état”. Officers keep the licence where screening plus behaviour suggest the criminal-level state of intoxication, or where the approved device has established it. The full text of article L. 224-1 is published on Légifrance. The same retention applies to driving in a manifest state of drunkenness (état d’ivresse manifeste, where the driver’s condition speaks for itself) and to refusal to undergo the tests. You receive a receipt (récépissé de rétention) in exchange: keep it, because it proves the date and time from which every later deadline runs.

Retention is only the first step. Within seventy-two hours of the retention, or one hundred and twenty hours where evidential verifications were carried out, the préfet — the State’s representative in the département (the French administrative county) — must decide on an administrative suspension. Article L. 224-2 provides: “Le représentant de l’Etat dans le département doit, dans un délai de soixante-douze heures à compter de la rétention du permis de conduire prévue à l’article L. 224-1, ou dans un délai de cent vingt heures pour les infractions pour lesquelles les vérifications prévues aux articles L. 234-4 à L. 234-6 et L. 235-2 ont été effectuées, prononcer la suspension du permis de conduire” where the state of intoxication is established by an approved device, by the verifications, or by refusal to submit to them. The full text of article L. 224-2 is published on Légifrance. This administrative suspension (suspension administrative) is provisional: it lasts until the criminal court rules, up to a statutory ceiling, and it is entirely separate from any suspension the court later orders as a penalty. A separate provision, article L. 224-7, allows the préfet who receives the offence report to order a provisional suspension or a warning without waiting, where the prosecutor does not close the case. The full text of article L. 224-7 is published on Légifrance.

For a British licence holder, three practical points follow. First, the police will physically retain whatever document you hand over, including a United Kingdom photocard licence, and the receipt matters even more for a visitor who must catch a ferry or a flight: without it, you cannot prove when the measure started or challenge its duration. Second, a driver who holds no French licence can be prohibited from driving in France and from applying for a French licence for the duration, so “it is only a British licence” is no protection while you are on French soil. Third, the vehicle itself can be immobilised (immobilisation) on the spot under both the criminal and the fixed-penalty tracks, which is how a family holiday car or a hired car ends up in a pound (fourrière) on the first night of the trip. British residents who have exchanged their UK licence for a French one face the points system on top: the fixed-penalty drink-driving offence removes six points by operation of law (“Cette contravention donne lieu de plein droit à la réduction de six points du permis de conduire”), while the criminal offence halves the maximum points total (“Ce délit donne lieu de plein droit à la réduction de la moitié du nombre maximal de points du permis de conduire”).

Refusing the test is not an escape route; it is a separate criminal offence, punished as severely as the drink-driving itself. Article L. 234-8 of the Highway Code states: “Le fait de refuser de se soumettre aux vérifications prévues par les articles L. 234-4 à L. 234-6 ou aux vérifications prévues par l’article L. 234-9 est puni de trois ans d’emprisonnement et de 9 000 euros d’amende.” Refusing evidential verification carries up to three years’ imprisonment and a 9,000 euro fine, plus additional penalties including suspension of the licence for up to three years, cancellation of the licence, community service, day-fines and a ban on driving certain vehicles. The full text of article L. 234-8 is published on Légifrance. And two arguments against a refusal charge were closed by the Court of Cassation on 16 December 2025, in decision no. 25-80.933. The appeal court had acquitted a driver on the ground that the officers had never told him refusal was a criminal offence. The criminal chamber quashed the acquittal: the statutes punish only the refusal itself — “les textes susvisés réprimant le seul refus de se soumettre aux vérifications mentionnées par les articles L. 234-4 à L. 234-6, L. 234-9 et L. 235-2 du code de la route” — and the court had added a condition the statute does not contain. On criminal intent, the Court recalled that “la seule constatation de la violation, en connaissance de cause, d’une prescription légale ou réglementaire implique, de la part de son auteur, l’intention coupable exigée” by article 121-3 of the Criminal Code: knowingly breaking a legal prescription implies the guilty intent. The full decision of 16 December 2025, no. 25-80.933, is published on Légifrance. In short, “nobody told me it was an offence” does not defeat a refusal charge where the driver knowingly refused.

II. Prosecution, Penalties and How to Challenge a Drink-Driving Case in France

A. What Penalty Follows: Fixed Fine, Prosecutor Settlement or Criminal Court?

The track depends on the reading. Between 0.50 and 0.80 grams per litre of blood (0.25 to 0.40 milligrams of breath), the case stays on the fixed-penalty track: a fourth-class fine, up to three years’ suspension of the licence as an additional penalty, a possible alcohol-interlock requirement, and the automatic six-point deduction for French licence holders, with the vehicle liable to immobilisation. The procedure usually runs through a penalty notice and the police court (tribunal de police, the court for fixed-penalty offences) if contested. At 0.80 and above, the délit track opens, and with it three possible routes, in rising order of seriousness.

The lightest criminal route is the settlement with the prosecutor (composition pénale). So long as the prosecution has not yet been formally launched, the procureur de la République (the public prosecutor) may offer a settlement to a person who admits a délit carrying no more than five years’ imprisonment. The statute states: “Le procureur de la République, tant que l’action publique n’a pas été mise en mouvement, peut proposer, directement ou par l’intermédiaire d’une personne habilitée, une composition pénale à une personne physique qui reconnaît avoir commis un ou plusieurs délits punis à titre de peine principale d’une peine d’amende ou d’une peine d’emprisonnement d’une durée inférieure ou égale à cinq ans”. The measures can include a composition fine paid to the Treasury, capped at the maximum fine for the offence and payable over up to a year, surrender of the vehicle used, and other obligations. Once the person accepts and the court president validates the settlement, the case ends without a trial. The full text of article 41-2 of the Code of Criminal Procedure is published on Légifrance. For a first-time British offender with a reading just over the criminal threshold and no accident, this is the outcome a lawyer usually aims for.

The middle route is the guilty-plea fast track (comparution sur reconnaissance préalable de culpabilité, known as CRPC). Where the person admits the facts, the prosecutor may propose one or more of the penalties available, and the person appears the same day before a judge who approves or rejects the proposal. Article 495-7 of the Code of Criminal Procedure opens this route to all délits except those excluded by statute, “lorsque cette personne reconnaît les faits qui lui sont reprochés” — where the person admits the alleged facts. The full text of article 495-7 is published on Légifrance. Where prison is proposed, article 495-8 caps it: “Lorsqu’est proposée une peine d’emprisonnement, sa durée ne peut être supérieure à trois ans ni excéder la moitié de la peine d’emprisonnement encourue.” A proposed prison term cannot exceed three years or half the sentence available for the offence, and the prosecutor must say whether a firm term would start immediately or go before the sentence-enforcement judge for arrangements such as a tag (détention à domicile sous surveillance électronique). The full text of article 495-8 is published on Légifrance. Refusing the proposal sends the case to a full trial, so the decision to accept or refuse is the single most consequential choice of the day, and no one should make it without counsel.

The heaviest route is trial before the criminal court (tribunal correctionnel): up to three years’ imprisonment and a 9,000 euro fine for the basic offence, with higher penalties where drink-driving combines with an accident, injury or reoffending, plus the automatic halving of licence points for French licence holders and the additional penalties of suspension, cancellation, community service and driving bans. Whatever the route, two side consequences deserve attention. Your motor insurer must be told in accordance with the policy wording, because drink-driving can affect cover for the driver’s own losses. And if you drive for a living, tell your employer early: a suspension that stops you driving can become an employment problem within days, and the employment consequences move faster than the criminal case.

B. How to Challenge the Case: Procedure Defects, Counter-Proof and British-Specific Points

French drink-driving files are won and lost on procedure, because the machine and the paperwork do most of the accusing. The starting point favours the prosecution: police reports (procès-verbaux) are taken as true unless the contrary is proved, and only in writing or by witnesses. The Court of Cassation restated the rule on 5 May 2026, in decision no. 25-84.217, quashing a police-court acquittal that had been given without reasons: “les procès-verbaux dressés par les officiers et agents de police judiciaire font foi jusqu’à preuve contraire des contraventions qu’ils constatent. La preuve contraire ne peut être rapportée que par écrit ou par témoins.” Reports by judicial police officers prove the offences they record until the contrary is shown, and the contrary can be shown only in writing or by witnesses. The full decision of 5 May 2026, no. 25-84.217, is published on Légifrance. Simply telling the court the reading must be wrong is therefore not enough; a challenge needs documents, witness statements, or a demonstrable procedural defect.

The defects that work are concrete and checkable from the file. Was the device approved (homologué) and within its calibration date? Were the two breath measurements consistent, and were the screening and evidential stages kept in the order the statute requires? Was the margin of error actually subtracted, and does the corrected figure still clear the threshold, following the 4 March 2025 ruling? Was the driver told of the right to a confirmatory blood test where one applies, and were the time gaps between tests respected? Each of these questions maps to a line of the report, and each negative answer is a written contrary proof of the kind the 5 May 2026 decision demands. This is painstaking work on the papers, and it is why anyone facing the criminal track should have the file reviewed by a lawyer before choosing between settlement, guilty plea and trial: the right route depends on what the papers can and cannot prove.

Three British-specific points complete the picture. First, language. Anything you sign at the roadside or in custody — the record of the test, a summons (convocation), a settlement proposal — is in French and will be used in court. You may ask for an interpreter and for time to understand what is put in front of you; signing a document you have not understood never improves your position. Second, residence. A visitor stopped on a short trip will usually be dealt with while still in France, sometimes within days through the fast-track procedures, so giving a reliable French address for service (adresse de signification), such as the holiday rental or a relative’s home, avoids a summons going astray and a judgment in absence. A British resident faces the longer game: administrative suspension now, criminal court later, and the points consequences on the French licence, with the exchange rules explained in our guide to the UK licence exchange on ANTS. Third, the fixed-penalty paperwork. Where the case stays on the contravention track, the fine notice follows the same administrative machinery as other road fines, and the method for contesting it — deadlines, online challenge, consignation — is the one described in our guide to contesting French speeding fines on a UK licence; the difference is that drink-driving adds the evidential device and the possible suspension to the file, so the challenge must attack the measurement as well as the notice.

Time limits run from the first day, so the order of operations after a stop is simple: keep the retention receipt and every document handed to you; note the exact times of the tests and the names on the paperwork; do not drive while prohibited, because driving during suspension is itself a criminal offence; photograph the scene and keep witnesses’ details where an accident or a disputed stop is involved; and take advice before the first hearing, because accepting a settlement or a guilty-plea proposal closes doors that a trial would keep open. The 72-hour and 120-hour clocks on the administrative suspension, the short deadline for challenging a fixed fine, and the fast-track hearing dates all punish delay, and a British driver who has already returned to the United Kingdom must organise representation rather than assume distance pauses the case.

Conclusion

The French system is stricter than the English one at every stage: a lower limit of 0.50 grams per litre for ordinary drivers and 0.20 for new and professional drivers, testing powers that need no prior offence, immediate roadside retention of the licence followed by a prefectural suspension within days, a criminal offence from 0.80 carrying up to three years’ imprisonment and a 9,000 euro fine, and a refusal punished just as severely. Against that stands a procedure full of checkable requirements — approved devices, the error margin the judge must apply, reports that prove their contents only until written or witness evidence says otherwise — and three very recent Court of Cassation decisions showing exactly how courts police those requirements. The British driver who understands the thresholds before dinner, keeps every paper after a stop, and challenges the measurement rather than the principle gives the French courts something solid to work with, which is the only kind of defence these courts accept.