Fines and penalties for cannabis at the wheel

Typical penalty ranges

• Monetary penalty: 20–90 day-fines (daily amount by income: CHF 30–3,000).
• Additional fine: CHF 400–1,500 (varies by canton).
• Blood analysis: ~CHF 700; hair: ~CHF 500–800.
• Lawyer (recommended): typically CHF 1,500–3,500 for a standard case.

Swiss practice: procedure, deadlines and costs

The total financial burden of a cannabis driving incident is routinely underestimated, because several items add up. The penalty for driving while unfit (Art. 91 para. 2 lit. b SVG) is a monetary penalty in day-fine units — scaled to income, typically 20 to 60 units, suspended for first offenders, plus an unconditional connecting fine. On top come the penal order's procedural costs (CHF 300–800), blood analysis and toxicological report (CHF 900–1,500), the road traffic office's fee for the withdrawal decision (CHF 200–500) and, if ordered, the traffic-medicine assessment with abstinence controls (CHF 1,500–4,000). Do not forget insurance: liability insurers often downgrade the class after an unfitness case and may seek recourse where fault applies. In sum, a first incident realistically costs between CHF 3,000 and 8,000.

The legal limit and the zero-tolerance practice

In Switzerland, a strict zero-tolerance practice applies to road traffic regarding tetrahydrocannabinol. The legally anchored limit is 1.5 micrograms of THC per litre of blood. This value represents a pure detection limit, as from this concentration onwards, an inability to drive is scientifically assumed. Anyone who exceeds this limit is legally deemed absolutely unfit to drive, without any concrete proof of impairment having to be provided. This strict regulation differs significantly from the limits for alcohol, where certain tolerance ranges exist.

For the assessment of driving aptitude, it is not only the active THC in the blood that is relevant, but also its degradation products such as THC carboxylic acid. While active THC degrades rapidly, the metabolites remain in the body and can indicate regular consumption. The Road Traffic Office often relies on these values when ordering traffic medical assessments. Regular consumption can fundamentally call driving aptitude into question, even if there was no acute impairment at the time of driving. The distinction between acute consumption and chronic behaviour is therefore crucial for the procedure.

The traffic medical report and abstinence monitoring

If there is a suspicion of cannabis dependence or regular abuse based on police findings or laboratory values, the Road Traffic Office orders a traffic medical assessment. This evaluation serves to verify driving aptitude and is carried out by specialised traffic medicine experts. Within the scope of this procedure, those affected must prove that they have their consumption permanently under control or live completely abstinent. The costs for these complex examinations and the associated laboratory analyses must be borne by the affected individuals themselves.

Proof of abstinence is usually provided via urine tests under supervision or through hair analyses. Hair analyses are particularly conclusive because they can document consumption retroactively over several months. One centimetre of scalp hair can reflect consumption behaviour over approximately one month. To reissue the driving licence, the Road Traffic Office usually requires seamless proof over a longer period. If degradation products are detected again during this phase, the ban period is significantly extended, and the procedure often starts all over again.

Special considerations for medical cannabis and CBD consumption

Since August 2022, medical cannabis has been prescribable by doctors in Switzerland without an exceptional permit from the Federal Office of Public Health. However, this facilitation in therapeutic products law does not exempt patients from the strict road traffic regulations. Even with legal medical therapy, the limit of 1.5 micrograms of THC per litre of blood applies. Anyone driving under the influence of medical cannabis must be able to prove that their driving ability is not impaired and that appropriate medical instruction has been provided. In practice, the risk of conviction remains high.

The consumption of CBD products represents another risk. Although cannabis with a total THC content of less than one percent is legal in Switzerland and does not fall under the Narcotics Act, consuming large quantities can lead to exceeding the THC limit in the blood. Since CBD flowers often contain small traces of THC, this active ingredient accumulates in the body during intensive consumption. During a police check, drivers cannot claim to have consumed exclusively legal CBD if the limit in the blood is exceeded.

Can I refuse the saliva test during a police check?

Yes, refusing a rapid saliva test on site is generally possible. However, in practice, this almost always leads to the police ordering a blood sample, provided there is a reasonable initial suspicion. Refusing the ordered blood sample itself is a punishable offence under the Road Traffic Act and is legally equated with unfitness to drive. This leads to the same harsh sanctions as a positive result, including the withdrawal of the driving licence.

How does participation in a Swiss cannabis pilot trial affect the driving licence?

Participation in state-approved pilot trials such as Züri Can or Weed Care does not exempt participants from the applicable road traffic regulations. The statutory limit of 1.5 micrograms of THC per litre of blood in road traffic also applies without restriction to participants in these scientific studies. Anyone who drives with a level exceeding the limit after legally purchasing and consuming cannabis within the framework of a pilot trial must expect the regular criminal and administrative law consequences.

What happens if I am checked with less than 10 grams of cannabis in the car?

The possession of up to 10 grams of cannabis for personal consumption is exempt from punishment for adults, and consumption can be punished with a fixed penalty fine of 100 francs, although the cantons enforce this differently. However, this regulation only concerns narcotics law. As soon as you drive a vehicle, the Road Traffic Act applies. If there is suspicion of recent consumption during the check and the blood limit is exceeded, the full sanctions for unfitness to drive apply despite the small amount in the vehicle.

Frequently asked questions

Is the criminal record entry deleted?

Monetary penalties under 90 day-fines with suspended enforcement don't appear on the private extract. The ADMAS entry stays for 10 years.

What is the realistic total cost of a first incident?

Often CHF 3,000–8,000: monetary penalty and connecting fine, procedural costs, blood analysis, road traffic office fee and, where ordered, the traffic-medicine assessment.