Also known as: Luxembourg THC driving threshold · Drug-driving law Luxembourg · Cannabis and driving Luxembourg

Cannabis Driving Impairment Laws in Luxembourg

Luxembourg enforces a strict 1 ng/mL per se limit on THC in blood while driving, with no medical exemption.

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Published Jul 23, 2026

Last reviewed Oct 31, 2026

This article is general information, not legal advice. Laws change; check current rules with official sources or a lawyer.

↯ The honest take

Luxembourg's 1 ng/mL threshold is a per se law—you don't have to be impaired to break it. Regular users can stay above 1 ng/mL for hours or days after use, so the rule effectively criminalises residual THC in blood, not acute impairment. Medical patients and cross-border drivers should know Luxembourg doesn't recognise medical exemptions or foreign prescriptions.

The 1 ng/mL per se driving limit

Luxembourg operates a per se drug-driving law under Article 12 of the Code de la route (Loi modifiée du 14 février 1955). It is an offence to drive with a blood concentration of delta-9-THC at or above 1 nanogram per millilitre (ng/mL). Strong evidence^[1]

Per se means the prosecution does not have to prove that you were actually impaired—the mere presence of THC at the threshold is itself the offence. Strong evidence^[1]

The 1 ng/mL cutoff is lower than some neighbouring jurisdictions and falls below levels typically associated with acute impairment in experimental studies, which generally cluster around 2–5 ng/mL for occasional users. Strong evidence^[2] In practical terms, a regular cannabis user can exceed 1 ng/mL for many hours—sometimes a full day or longer—after last use, even when they are not impaired. Strong evidence^[2]

How enforcement and testing work

Police Grand-Ducale can require a driver to undergo a drug test if they suspect drug use, following a traffic offence, or after an accident. The typical procedure is: Strong evidence^[1]

Roadside oral fluid (saliva) screening test—a rapid immunoassay device detects recent THC exposure.
Confirmatory blood test—if the saliva test is positive, the driver is taken for a blood draw. Blood is analysed by liquid or gas chromatography/mass spectrometry (LC-MS or GC-MS). The blood result is what determines whether the offence has been committed. Strong evidence^[1]

Refusing either test is itself a criminal offence and is treated similarly to refusing a breathalyser for alcohol. Strong evidence^[1]

Penalties

Driving with THC ≥ 1 ng/mL in blood exposes a driver to penalties under the Code de la route: Strong evidence^[1]

Fine: €500 to €10,000
Imprisonment: 8 days to 3 years (more serious cases, repeat offences, or if accident or injury resulted)
Licence withdrawal: from several months up to permanent revocation
Vehicle immobilisation: at the roadside

Penalties escalate sharply if cannabis use is combined with alcohol, if there was an accident, or if injury or death resulted. Judges have discretion within these ranges. Insurance consequences (loss of coverage, premium increases) are typically significant in practice, though handling by insurers falls outside the criminal law.

Home cultivation reform did not change driving rules

In July 2023, Luxembourg's Law of 18 July 2023 amended the 1973 drug law to allow adults to cultivate up to four cannabis plants per household for personal use and to possess the resulting harvest at home. Strong evidence^[3] Public possession of up to 3 grams was reclassified as a minor administrative offence.

However, the reform explicitly did not amend the Code de la route. The 1 ng/mL driving threshold remains in full force, and driving after home-grown cannabis use is treated identically to driving after any other cannabis use. Strong evidence^[3]^[4] Government communications around the reform emphasised that road-safety rules were unchanged. A broader regulated retail market has been discussed but, as of October 2026, has not been enacted.

Medical cannabis patients and driving

Luxembourg's medical cannabis programme has operated through hospital pharmacies since 2019 under the Law of 20 July 2018. Strong evidence^[5] Being a registered medical cannabis patient does not create an exemption from the 1 ng/mL driving rule. The law does not distinguish between medical and non-medical THC in blood. Strong evidence^[5]

Patients using prescribed cannabis who need to drive should discuss timing and dosing with their prescriber, but the legal threshold remains absolute.

Cross-border considerations

Luxembourg is small and heavily cross-border. Drivers moving between Luxembourg, Germany, France, and Belgium face different thresholds:

Germany: 3.5 ng/mL per se limit (as of 2024) Strong evidence^[6]
France: Per se, any detectable amount Disputed^[7]
Belgium: 1 ng/mL saliva-based (or 0 ng/mL in some circumstances) Disputed^[7]

Luxembourg's 1 ng/mL blood threshold applies the moment a driver crosses its border. Strong evidence^[1] A dose consumed legally at home in one country can still produce a criminal offence when driving through another. Luxembourg does not recognise foreign medical cannabis prescriptions as a driving defence.

This is not legal advice

This article summarises publicly available information about Luxembourg's cannabis driving law as of October 2026. Laws and enforcement practices can change; recent case law and administrative guidance can shift how statutes are applied.

If you are facing a charge, making decisions that depend on current law, or seeking guidance on how the rules apply to your situation, consult a licensed Luxembourgish avocat à la Cour (lawyer). Nothing in this article is legal advice.

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How this page was made

Generation history

Jul 22, 2026

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Oct 31, 2026

Revision

Jul 23, 2026

Fact-check pass — raised 2 flags