Saliva Screening 2025 in France: 5 Drugs Tested, Rules, Procedures, and Penalties
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THC, cocaine, amphetamines, methamphetamines, MDMA, opiates: in France, driving after drug use exposes to heavy penalties, even when the driver thinks they are no longer under the influence.
This guide explains what law enforcement looks for during a gendarmerie saliva test or police test, the thresholds set by the decree of December 13, 2016, the consequences of a positive result, the role of confirmatory analysis, and precautions to know before driving again.
Key points to remember about drugs while driving
A saliva test can be performed on site
Law enforcement can use a saliva screening test to detect the presence of drugs in a driver, especially in case of accident, offense, suspicion, or targeted control.
Main families searched for
Road tests specifically target THC, cocaine, amphetamines, MDMA, and opiates.
Heavily increased penalties
Driving after drug use is punishable by up to 3 years imprisonment, €9,000 fine, point deduction, and license suspension.
Key point: in France, the offense targets driving after using substances or plants classified as drugs. The debate therefore does not only concern the driver's feeling, but the detection of a substance within the framework provided by the Highway Code.
Legal framework 2026: what the Highway Code says
Driving after drug use is governed by articles L.235-1 to L.235-5 of the Highway Code. Since the law of July 9, 2025, the main penalty provided for driving after drug use has been strengthened.
Important clarification: refusal to submit to the checks provided by the Highway Code also constitutes an offense, but it must be legally distinguished from a positive test. The applicable sanctions should therefore not be summarized as strictly identical.
Which drugs are detected by a roadside saliva test?
Saliva tests used in a road context look for the main families of drugs responsible for impairing alertness, reflexes, danger perception, or driving behavior.
THC
THC is the active ingredient in cannabis. It can impair attention, reflexes, coordination, and risk perception, even when the driver believes they are fit to drive.
Cocaine
Cocaine can cause overestimation of abilities, more aggressive driving, increased impulsivity, and decreased alertness after the stimulating phase.
Amphetamines
Amphetamines can artificially reduce the feeling of fatigue but increase nervousness, disorientation, and risky behaviors.
Methamphetamines
Methamphetamines are powerful stimulants that can disrupt attention, danger perception, and the ability to react properly.
MDMA
MDMA can alter perception, promote dehydration, delayed fatigue, and poor judgment of distances or risks.
Opiates
Opiates, such as certain derivatives of morphine or heroin, can cause drowsiness, psychomotor slowing, and decreased alertness.
Screening and analysis thresholds in France
The decree of December 13, 2016 sets the procedures for screening substances indicating drug use, as well as the thresholds applicable to confirmatory saliva or blood analyses.
Not to be confused: a detection threshold is not a “driving authorization.” It is used to regulate the screening or analysis procedure. In case of consumption or doubt, the only safe decision remains not to drive.
How does a roadside drug test with a positive result proceed?
During a roadside check, law enforcement can implement a progressive procedure: rapid screening, license retention, additional sampling, then administrative or judicial decision depending on the results.
On-site screening: a saliva test can be performed by law enforcement to detect the presence of drugs.
Positive result: in case of a positive result, the license may be immediately retained under the framework provided by the Highway Code.
Vehicle: the vehicle can be immobilized or entrusted to a driver fit to drive depending on the circumstances, the presence of a companion, and the decision of law enforcement.
Confirmatory analysis: a saliva or blood sample can be sent to a laboratory to confirm the presence of the substance.
Administrative decision: the prefect can impose an administrative suspension of the license before any possible judicial follow-up.
Court of Cassation ruling of March 12, 2025: this decision strengthens the scope of screening by limiting certain technical challenges regarding the test model, its expiration date, or its conditions of use when the procedure complies with the applicable framework.
CBD, THC and driving: why the risk always exists
CBD is not THC. However, some CBD products may contain traces of THC. Yet, in terms of driving, detectable THC presence can cause problems, even when the driver claims to have consumed a product presented as legal.
The Court of Cassation’s case law has already recalled that the thresholds set by the decree of December 13, 2016, do not necessarily distinguish illicit cannabis use from the use of a CBD product containing THC. For the driver, this creates a very real risk in case of a check.
CBD does not mean no risk while driving.
A CBD product may contain residual THC. In case of a positive THC saliva test, the origin of the THC can be difficult to argue in the procedure. As a precaution, do not drive after consumption likely to result in THC detection.
How long can a THC saliva test remain positive?
Research such as saliva drug test gendarmerie how long, THC saliva test gendarmerie or THC saliva test gendarmerie shows that many drivers look for a precise duration. In reality, there is no universal reliable timeframe for everyone.
The result depends on the profile
The detection duration depends on the frequency of use, the amount consumed, the time since the last use, metabolism, oral hygiene, and the quality of the sample.
A self-test can help, but does not guarantee everything
A THC saliva test can help reduce uncertainty in a prevention approach, but it does not replace an official check or a confirmatory analysis.
Simple rule: if you have consumed cannabis, CBD containing THC, or another substance likely to impair driving, do not drive. The prevention test is a decision support tool, not a driving authorization.
Can you buy a gendarmerie saliva test?
Many internet users search for buy gendarmerie saliva test, gendarmerie saliva test, THC saliva test pharmacy, or THC saliva test. This wording needs clarification: tests officially used by the police or gendarmerie fall under a regulated framework.
Tests marketed by AMA Prévention are intended for prevention, self-screening, companies, healthcare professionals, local authorities, and road safety actions. They should not be presented as official police or gendarmerie tests.
AMA Prévention solutions for screening and road safety
AMA Prévention offers reliable screening tests for individuals, healthcare professionals, companies, local authorities, transporters, and prevention actors. Drugdiag® solutions help support prevention efforts related to narcotics, road safety, and sensitive positions.
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FAQ — Saliva test, THC, gendarmerie, and drug driving
Which drugs are tested for in a road saliva test?
Road saliva tests look for THC, cocaine, amphetamines, methamphetamines, MDMA, and opiates. Substances and thresholds must be interpreted according to the applicable regulatory framework.
Can a THC saliva test be positive after CBD?
Yes, it is possible if the CBD product contains residual THC or if consumption results in a detectable presence of THC. CBD therefore does not guarantee a total absence of risk when driving.
How long does THC remain detectable in saliva?
There is no single duration. Detection depends on consumption frequency, quantity, time since last use, test threshold, metabolism, sample, and usage conditions.
Can you buy a gendarmerie saliva test?
Tests officially used by the gendarmerie or police are regulated. Online, it is possible to buy preventive or self-screening saliva tests, without presenting them as official gendarmerie tests.
Can the counter-analysis change the outcome of a check?
The confirmatory analysis plays an important role in the procedure. If it does not confirm the presence of drugs, the situation may change. However, if it confirms the presence of a targeted substance, the risk of prosecution remains.
What are the risks of driving after drug use?
Driving after drug use is punishable by up to 3 years in prison, a €9,000 fine, a 6-point deduction, license suspension, and possible additional penalties.
What to do in case of doubt before driving?
The only completely safe decision is not to drive. A preventive saliva test can help reduce uncertainty, but it does not replace an official check or a confirmatory analysis.
Sources and official references
Sources used for verification: Highway Code, articles L.235-1 to L.235-5; decree of December 13, 2016, setting the procedures for screening substances indicating drug use and analyses provided by the Highway Code; Court of Cassation, criminal chamber, June 21, 2023; Court of Cassation, criminal chamber, March 12, 2025, no. 24-82.925; Service-Public.fr, section “Drug driving.” Informative article not replacing individualized legal advice. In case of procedure, refer to official texts and a competent professional.
Article updated in April 2026 by AMA Prevention. Information regarding sanctions, thresholds, and procedures may change. Before any legal or professional decision, check the current official texts.
1 comment
Bonjour ce weekend j’ai eu un contrôle pour le Stup alors que je n’avais rien consommé le test était positif le contrôle a mis au moins une heure et demie avant de pouvoir avoir les traits ou pas sur le test ça a mis au moins 30 minutes et ils l’ont mis sur le chauffage pour soi-disant que le produit agisse mieux est-il possible que le test soit positif à cause de la chaleur ou d’avoir attendu