What does Luxembourg law say about cannabis and driving?
In Luxembourg, the legal THC limit for drivers is 1 ng/ml of blood – a level that is effectively equivalent to a zero-tolerance policy.
Important: You no longer need to be ‘high’ to test positive. Although the intoxicating effects of cannabis usually last only a few hours, THC can remain detectable in the body for much longer. Depending on the individual and their pattern of use, the legal limit may still be reached or exceeded days or even weeks after the last use.
This means that just because you feel sober again does not automatically mean you are legally allowed to drive. Even the next day or later, your THC level may still be above the permitted limit.
This rule applies to all road users, including:
cars
motorbikes, scooters
bicycles, e‑bikes
and other road vehicles
In short: anyone who has consumed cannabis should not rely on how they feel. The decisive factor is not whether you are still under the influence, but whether the legal THC limit in your blood is not exceeded.
What about CBD products?
Although CBD products do not cause a high, they still contain small amounts of THC. Depending on the amount and frequency of consumption, a THC level of 1 ng/ml of blood or more can be reached and detected. In this case, the same legal consequences apply as for THC-containing cannabis.
What about medical cannabis?
In Luxembourg, no distinction is made between medical and recreational cannabis use in road traffic. The same statutory THC limits apply to all road users. People being treated with medical cannabis should therefore not drive a vehicle.
What are the consequences of a positive THC test?
If you test positive for THC (or THC metabolites) whilst driving, you risk losing your driving licence and being fined.
In addition, your insurance company may refuse to cover the costs if you cause an accident whilst under the influence of cannabis, regardless of whether you were at fault or not.
Important: The new cannabis law does not alter this current legal situation. The limit has not been adjusted.
How long can cannabis be detected?
Exactly how long cannabis remains detectable varies greatly from person to person and depends on the amount consumed and the duration of use. The following information should be regarded as guidelines:
In saliva: cannabis can be detected via a saliva test for up to several hours. If the result is positive, a blood and urine sample will be taken from the person concerned.
In the blood: several hours for occasional use and several days for regular use.
In urine: 3–30 days, sometimes up to 3 months, depending on the duration and intensity of use.
In hair: the longer the hair, the longer consumption can be detected. For example, with hair 12 cm long, it is possible to determine consumption over a period of one year.
Does cannabis have any effect on driving at all?
The simple answer is ‘Yes!’ … It is generally accepted that cannabis can affect driving ability, including through its impact on:
reaction time
attention
coordination
visual perception
Driving at night (due to sensitivity to light caused by dry eyes) and poly-substance use (cannabis combined with alcohol and other drugs) are particularly risky.
A number of other factors influence whether a particular dose of cannabis impairs driving ability. These include the method of consumption (whether cannabis is smoked, inhaled or eaten), whether cannabis is consumed alone or with other substances (e.g. alcohol) and, above all, whether the user consumes cannabis rarely or regularly.
Summary: why you should not take part in road traffic whilst under the influence of cannabis:
If cannabis use is detected, you can expect fines and a driving ban.
In the event of an accident, your insurance cover will no longer apply.
Under the influence of almost any psychoactive substance, your perception is impaired. This is irresponsible towards others and yourself. When driving, you need a ‘clear head’.
There are various alternatives for getting from A to B if you have used cannabis:
public transport (free in Luxembourg)
taxi or other transport services
walking
or: one person in the group stays sober and takes the wheel…
If you have any other questions about cannabis, please contact our FroNo hotline:
- By phone: (+352) 49 7777 55, from Monday to Friday from 9am to 1pm.
- By e‑mail: email hidden; JavaScript is required
- By WhatsApp: (+352) 691 497 755
Here is a selection of additional Cannabis Know How Cards!
If you notice that a person is not well after having consumed legal or illegal drugs, act responsibly and look after that person. If in doubt, phone the emergency number and administer first aid.
Méi informéiert — manner riskéiert
The information provided here is based on current research findings and the current legislation (updated: July 2026)