You can end up convicted of driving after using narcotics when all you consumed was legally purchased CBD. This is not a theoretical scenario: it has been the position of the Cour de cassation (France's highest criminal court) since 2023.
The reason is simple. CBD is not a narcotic and nobody looks for it during a roadside check. But a compliant flower or resin can contain up to 0.3% Δ9-THC, and the Code de la route (French Highway Code) tolerates no amount of THC in a driver. No threshold, no margin.
What follows explains the wording of the law, the mechanism, the consequences, and what it means if you drive. Information up to date as of September 2026: check the articles cited on Légifrance (the official French law database), because the penalties changed in 2025.
Key points — Article L235-1 of the Code de la route punishes driving when a saliva or blood analysis establishes the use of narcotics, with no THC threshold whatsoever. The Cour de cassation (21 June 2023) confirmed that the dose and the origin of the THC are irrelevant: legal CBD containing traces of THC is enough. Penalties since the law of 9 July 2025: three years' imprisonment, a €9,000 fine, loss of half your licence points. No waiting time can be guaranteed. If you drive, the only risk-free option is not to consume any product containing THC.
What article L235-1 of the Code de la route actually says
The text targets "any person who drives a vehicle or who accompanies a learner driver when a blood or saliva analysis shows that they have used substances or plants classed as narcotics".
Three things to notice.
- The offence says nothing about being under the influence. Unlike alcohol, where the law sets a level, there is no question here of being "impaired" by anything. It is enough for the analysis to establish use.
- The accompanying person is covered. If you accompany someone under France's accompanied or supervised driving schemes, the text applies to you just as it does to the driver.
- THC is a narcotic, CBD is not. That is the only reason CBD comes into this at all.
No THC threshold: the Cour de cassation ruling of 21 June 2023
In this case (appeal no. 22-85.530), a driver prosecuted for driving after using narcotics had been acquitted on appeal. The court of appeal criticised the expert report for not stating the THC level. The Cour de cassation quashed that judgment. Article L235-1, it said, criminalises the mere fact of driving after having used narcotics, as soon as that use is shown by an analysis. The dose absorbed does not matter.
The official Service-Public website (the French government's public information portal) summed up the scope of the decision bluntly: driving after consuming CBD that contains traces of THC is an offence.
Detection thresholds versus thresholds for the offence
There are indeed figures in the regulations. The arrêté of 13 December 2016 (ministerial order) sets minimum detection thresholds for THC:
- 15 ng/ml of saliva for the roadside screening test;
- 1 ng/ml of saliva for the confirmatory laboratory analysis;
- 0.5 ng/ml of blood for the blood analysis.
These are performance requirements imposed on the tests and the laboratories. They are not levels below which you would be in the clear. The Cour de cassation said so explicitly: detection threshold, not threshold for the offence.
Why a compliant 0.3% product can trigger a screening test
The maths
One gram of flower at 0.3% Δ9-THC contains up to 3 mg of THC. That is very little compared with narcotic cannabis, and it does not produce the high of cannabis. CBD itself does not get you high. But a laboratory working in nanograms per millilitre does not need much.
Inhaling deposits THC in your mouth
The saliva test analyses what is in your saliva. When you smoke or vaporise, the smoke or vapour coats the inside of your mouth directly. Studies on inhaled cannabis show a peak of THC in saliva in the minutes that follow, then a rapid decline (Arkell et al., 2019). With a hemp flower the quantities are far smaller, but the mechanism is the same. A useful reminder: combustion is harmful to your health whatever the plant.
Flowers and resins are "full spectrum" products by nature
A CBD flower is raw plant material. A CBD resin is concentrated plant material. Both contain the full range of hemp cannabinoids, THC included, which is what is called full spectrum. The CBD percentage on the label tells you nothing on this point: a Tyson at 19.45% CBD and a Népalais gras at 48.38% are subject to the same 0.3% THC ceiling, and both can contain traces of it.
Regular use changes the picture
THC is a molecule that is stored in fat. In someone who consumes every day, even in small amounts, it can build up and remain measurable for longer than in an occasional user. The exact durations vary too much from one person to another to be given honestly as figures.
And if the product is not compliant?
A "less than 0.3%" label is only a label. Only a per-batch certificate of analysis, issued by an independent laboratory, lets you check the Δ9-THC line. Demand it from any seller, and learn how to read it with our COA guide.
Does CBD itself impair driving?
This is a separate question from the legal one.
The most cited study is a randomised trial published in JAMA in 2020 (Arkell et al.), conducted at Maastricht University. Twenty-six participants vaporised different types of cannabis, then took a driving test on a real road. With THC-dominant cannabis, lane-keeping was significantly worse in the hour and a half after use. With CBD-dominant cannabis, no significant difference from placebo was measured.
The limitations are clear: a small sample, a single dose, healthy adults. It says nothing about heavy use, or about mixing with alcohol or a medicine. Some users report drowsiness. Common-sense rule: if you feel slowed down, you do not drive.
And above all, this result changes nothing in law. The offence does not rest on impaired ability, but on the presence of THC in the analysis.
What you actually risk
The penalties below are those of article L235-1 as worded since law no. 2025-622 of 9 July 2025. If you have "two years and €4,500" in mind, that is the old version.
- Main penalty: three years' imprisonment and a €9,000 fine. These are maximums; the judge sets the sentence case by case.
- If you are also over the alcohol limit: five years' imprisonment and a €15,000 fine.
- Points: automatic loss of half the maximum number of points on the licence, i.e. 6 points out of 12. Three quarters when combined with alcohol.
- Possible additional penalties: suspension of the licence for up to five years with no exemption for professional driving, cancellation of the licence with a ban on retaking it for a period of up to five years, community service, day-fines, an awareness course on road safety or on the dangers of narcotics, confiscation of the vehicle.
Even before any judgment, a positive screening test in practice leads to the police holding on to your licence on the spot, followed by a suspension decided by the préfet (the state's local representative). We do not give durations here, as they depend on the texts in force and on the préfet's decision: check them on Légifrance or Service-Public. By way of illustration, in the case decided in 2023, the trial court had handed down a two-month suspended prison sentence and a six-month licence suspension.
Think about the knock-on effects too: a criminal record, a job that requires a licence, an insurance policy to reread.
What this means if you drive
No lecture, just the logical consequences of the above.
- There is no safe waiting time. The "6 h, 12 h, 24 h" charts that circulate are extrapolations. None of them protects you legally, and none takes account of your actual use or your metabolism.
- If you drive every day, regular use of flowers or resins is hard to reconcile with zero risk. That is information; the decision is yours.
- If you drive occasionally, keep the two as far apart as possible: no consuming before getting behind the wheel, nor the day before a long journey, and bear in mind that even that is no guarantee.
- Do not rely on a "0% THC" claim without an analysis showing THC as not detected, together with the laboratory's limit of quantification.
- Professional drivers: more than your licence is at stake. A positive test can directly affect your employment contract.
- Do not try to "beat" the test. The tricks that circulate rest on nothing solid, and it is the laboratory analysis that counts, not the roadside test.
If you are stopped, the full procedure and your rights (blood sample, second expert analysis within five days) are set out in saliva test after CBD. For the general framework, see CBD and the law in France.
Sources
- Code de la route, article L235-1, as worded since the law of 9 July 2025.
- Loi n° 2025-622 du 9 juillet 2025 créant l'homicide routier et visant à lutter contre la violence routière.
- Cour de cassation, chambre criminelle, 21 juin 2023, pourvoi n° 22-85.530, published in the court's official bulletin.
- Service-Public, « Conduire après avoir consommé du CBD est interdit », 31 July 2023.
- Arrêté du 13 décembre 2016 fixant les modalités du dépistage des substances témoignant de l'usage de stupéfiants.
- Code de la route, articles R235-6 and R235-11 (blood sample and second expert analysis).
- MILDECA, « Le CBD », page updated on 21 May 2025.
- Arkell TR et al., « Effect of Cannabidiol and Δ9-Tetrahydrocannabinol on Driving Performance: A Randomized Clinical Trial », JAMA, 2020.
- Arkell TR et al., « Detection of Δ9 THC in oral fluid following vaporized cannabis with varied cannabidiol (CBD) content », Drug Testing and Analysis, 2019.
