La conduite sous l’influence du cannabis : un danger croissant pour les conducteurs et les usagers de la route.

Cannabis and Driving: Risks, Testing, and Penalties in 2026

To remember. Cannabis can impair attention, coordination, distance judgment, and reaction time. In France, the offense is based on drug use established by a saliva or blood analysis: there is no "legal limit" of THC allowing driving.

Why does cannabis increase the risk on the road?

THC affects functions essential for driving. After consumption, a person may underestimate their decreased alertness, react more slowly, maintain their trajectory less precisely, or make poor decisions. Alcohol and cannabis combined further increase the danger.

The effects felt and the detectable presence of THC do not exactly follow the same duration. Feeling "normal" therefore does not allow concluding that driving is safe or that a check will be negative.

How does a roadside check take place?

Law enforcement generally uses a saliva screening test. If it is positive, a saliva sample is taken for laboratory confirmation. The driver must be informed of the possibility to request a blood sample in order to reserve the right to a counter-expertise.

Two thresholds not to be confused. The decree of December 13, 2016 sets a minimum detection threshold of 15 ng/mL of THC for saliva screening of cannabinoids. The confirmation analysis in the laboratory relies on more sensitive methods. The technical threshold of a test is not a driving authorization threshold.

What sanctions in 2026?

Driving after drug use is punishable by three years imprisonment and a €9,000 fine. Six points are deducted from the license. Suspension or cancellation of the license, vehicle immobilization or confiscation, and mandatory courses may also be imposed.

In case of combination with alcohol, penalties can reach five years imprisonment and €15,000 fine, with a nine-point license deduction.

Can a self-test guarantee that one can drive?

No. A self-test is an indicative prevention tool. It does not measure actual driving ability, does not replicate the entire official procedure, and does not guarantee a future negative result or the absence of penalties.

The safest rule remains simple: after consuming cannabis or a product likely to contain THC, do not drive. Arrange for a sober driver, public transport, a taxi, or accommodation.

What is the purpose of a personal saliva test then?

When used correctly, it can provide additional information in a prevention approach. Its result must always be interpreted according to the targeted substance, the announced threshold, the instructions, and the device's limitations. A negative result should never be presented as permission to resume driving.

Discover preventive saliva tests

Official sources: Service-Public — Drugged Driving ; Légifrance — Decree of December 13, 2016.
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