The Court of Cassation validates the use of saliva tests without proof of their reliability

A key decision for the legal framework of road screenings

On March 12, 2025, the Court of Cassation issued an important ruling that clarifies the legal framework for saliva drug screening tests conducted by law enforcement. The ruling (appeal no. 24-82.925) overturns a decision by the Rennes court of appeal that had annulled a procedure on the grounds that the police had not provided precise information on the reliability of the test used.

This decision could have a direct impact on road checks, but also on debates surrounding prevention and the fight against drug use while driving.

The facts of the case: an acquittal overturned by the Court of Cassation

The case concerned a driver stopped in February 2019 by the gendarmes, who conducted a saliva test revealing the presence of drugs. Based on this screening, samples were taken and confirmed the positive result.

Convicted at first instance, the driver had won the case on appeal, the court having considered that the lack of precise information about the test (brand, batch number, expiration date) prevented verification of its reliability.

The Attorney General then filed an appeal to the Court of Cassation, contesting this annulment.

Why did the Court of Cassation overturn the court of appeal's decision?

The Court of Cassation relied on articles L. 235-1 and L. 235-2 of the Highway Code to make its decision. According to these texts:

• Saliva screening tests only serve to presume drug use.
• They allow authorization of a biological sample which can then establish the offense in an irrefutable way.
• Law enforcement is not required to prove the reliability of the saliva test, nor to specify its technical references.

The Court of Cassation therefore ruled that the court of appeal had made a legal error by annulling the procedure for a reason that was not legally founded.

Consequence: the decision is overturned and the case will be retried.

What are the consequences for drivers and road safety prevention?

This decision strengthens the legitimacy of saliva tests, which are now indisputable, even if their reliability is not demonstrated on a case-by-case basis. This raises several questions:

• From a legal standpoint
  From now on, a positive screening will hardly be contestable in court, except in cases of clear procedural error. This strengthens law enforcement powers but also potentially reduces defense options for drivers.

• From a test reliability standpoint
  Some experts worry that a saliva test can detect traces of substances consumed several days earlier, without necessarily indicating impairment at the time of the test.

• From a prevention standpoint
  This decision highlights the importance of raising more awareness rather than limiting to a strictly repressive framework. Indeed, many drivers do not know how long drugs remain detectable in their system, which can expose them to a positive test even if they no longer feel the effects.

Screening and prevention: what balance?

Drug screening while driving is primarily a road safety measure aimed at protecting users. However, its effectiveness also depends on prevention and driver information.

💡 Some facts to remember:

• Cannabis can be detected up to 24 hours after consumption, or longer in case of regular use.
• Cocaine and amphetamines remain on average 12 to 24 hours in saliva.
• Unlike alcohol, where the effect is directly measurable in mg/L of blood, drug tests do not indicate whether a driver is still under the influence or has simply consumed recently.

A responsible approach to avoid repression

Rather than limiting to sanctions, it is essential to develop prevention tools:

✔️ Inform about drug detection times
✔️ Encourage self-testing before driving
✔️ Train companies and event organizers in prevention

It is with this in mind that AMA Prévention offers reliable screening tests, as well as awareness solutions to prevent risks before they lead to sanctions.

Conclusion

The ruling of March 12, 2025 marks a turning point in jurisprudence on drug screening. It strengthens the punitive framework while raising questions about prevention and driver information.

While screening remains essential to ensure safety on the road, it is just as crucial to support these measures with appropriate awareness to avoid risky behaviors and reduce offenses rather than simply punish them.

We value your opinion!

What do you think of this decision? Should prevention be strengthened? Share your opinion in the comments! 💬🚗

💡 To go further:
📌 Articles L. 235-1 and L. 235-2 of the Highway Code → Legifrance
📌 Full decision of the Court of Cassation → Court of Cassation

About AMA Prévention

As a committed player in risk behavior prevention, AMA Prévention supports companies, event organizers, and individuals with screening and awareness solutions.

Find our resources on ama-prevention.fr 🚀

💡 Practical information on screening

During a roadside check, the gendarmerie saliva test is commonly used to detect the presence of drugs. Many wonder about how long the gendarmerie saliva drug test stays positive: it depends on metabolism, but THC remains detectable for several hours to a few days. The gendarmerie thc saliva test (or gendarmerie saliva thc test) specifically targets recent cannabis use.

To promote prevention at home or in the workplace, performing a thc saliva test (also called saliva thc test) is an excellent approach. If you are looking to equip yourself, you might wonder where to buy a gendarmerie saliva test equivalent? Although it can sometimes be difficult to find a thc saliva test at a pharmacy, you can order our professional devices directly online.