Drugs while driving in France: testing, procedure, and prevention
Partager
In what situations can a screening be carried out?
Screening is mandatory after a fatal or bodily injury accident. It can also be carried out after a material accident, an offense, suspicion of use, or during an operation organized by the police or the public prosecutor.
Police and gendarmerie mainly use a saliva test. The urine test exists but is less used on the road and falls under a different framework.
Screening and verification: two distinct steps
- quick saliva sampling: the device searches for certain families of drugs;
- test reading: the result guides the next steps of the procedure;
- verification: if positive, a saliva sample is analyzed by a laboratory or an accredited expert;
- counter-expertise: the driver must be informed of the possibility to reserve this right, which involves a blood sample according to the prescribed procedure.
Which substances are searched for?
Road devices mainly target cannabis, cocaine, opiates, and the amphetamine family, which may include methamphetamines and MDMA depending on the test used.
The exact list and thresholds depend on the device. A new substance, a medication, or a synthetic cannabinoid may not be properly identified by a standard test.
What sanctions are currently provided?
The official Service-Public fact sheet, verified on July 11, 2025, states that driving after drug use can be punished by up to three years imprisonment and €9,000 fine, with a six-point deduction. In case of combination with alcohol, the maximum penalties and point deductions are increased.
A suspension or cancellation of the license, immobilization or confiscation of the vehicle, mandatory courses, and other complementary penalties may also be imposed. The exact consequences depend on the case and the law in force at the time of the facts.
Does the driver have to appear "under the influence"?
The French offense is based on use established by analysis, not only on the driver's appearance or feeling of being fit to drive. The absence of perceived effect therefore does not guarantee the absence of legal or road risk.
How long can a saliva test remain positive?
There is no universal duration. Detection varies according to the substance, quantity, frequency of use, mode of consumption, device threshold, and individual characteristics.
Estimates published online cannot guarantee negativity. This caution is especially important for cannabis and CBD products that may contain THC.
What value does a self-test have before driving?
A saliva test intended for prevention can provide information on the substances it searches for, at the threshold indicated in its instructions. It never constitutes authorization to drive.
- a negative result does not exclude all substances;
- it does not directly measure alertness or reflexes;
- it may differ from the equipment and thresholds used by law enforcement;
- after consumption, the safe decision remains not to drive.
See saliva testsRead the full legal guide
