THC Saliva Tests (Cannabis): 15 ng/ml vs 50 ng/ml
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Not all salivary THC tests are equal. The detection threshold, expressed in ng/ml, directly affects the test’s ability to detect recent or low consumption. In France, the reference salivary THC threshold under the Highway Code is set at 15 ng/ml. A THC test at 50 ng/ml is therefore less sensitive for this molecule and may not meet the same prevention requirements.
Key point: this article mainly concerns THC in saliva. The THC threshold should not be confused with thresholds for other drug families: cocaine, amphetamines, MDMA, opiates, or methamphetamines may have their own regulatory or technical thresholds depending on the test and context of use.
Why salivary screening has become essential
The saliva test is now one of the most used tools to detect recent drug use. It is fast, non-invasive, easy to implement, and suitable for prevention contexts: road safety, workplace, transport, events, self-testing, or professional support.
Speed
Saliva sampling is simple and provides a quick initial indication without heavy equipment or urine sampling.
Recent use
Saliva is particularly relevant when looking for recent exposure to a substance, especially in a driving or high-risk work context.
Prevention
A saliva test can be used as a guidance and dialogue tool, provided the device is suitable for the context and its limits are well understood.
15 ng/ml vs 50 ng/ml: understanding the difference
The detection threshold corresponds to the minimum concentration at which the test can react to a substance. For salivary THC, the lower the threshold, the more sensitive the test.
THC test at 15 ng/ml
- More sensitive threshold for salivary THC
- Aligned with the threshold set by the French decree of December 13, 2016, for roadside salivary THC screening
- Better suited for serious self-testing, road safety, and demanding environments
- Reduces the risk of missing a low or recent concentration
THC test at 50 ng/ml
- Less sensitive threshold for salivary THC
- May be suitable for some general uses or foreign markets depending on objectives
- Higher risk of a negative result if the concentration is below 50 ng/ml
- Less consistent when trying to approach the French threshold used for THC road screening
Warning: a more sensitive test does not mean it alone “authorizes” or “prohibits” driving. A rapid test result must be interpreted cautiously, according to the instructions, context, and if necessary, confirmed by an appropriate analysis.
What French regulations say about salivary thresholds
The decree of December 13, 2016 sets the rules for screening substances indicating drug use under the Highway Code. For saliva screening, the minimum THC detection threshold is set at 15 ng/ml saliva.
Why it’s important: comparing only “15 ng/ml” and “50 ng/ml” without specifying the molecule can be misleading. For salivary THC, 15 ng/ml is the reference threshold mentioned in the French road regulations. For other substances, thresholds may differ.
CE standards, ISO 13485, and French manufacturing: why it matters
A saliva test is a screening device that must be chosen carefully. Quality depends not only on price or the number of substances listed but also on traceability, compliance, instructions, manufacturer, detection threshold, and quality control.
CE marking
The CE marking indicates that the device meets applicable European requirements for safety, performance, and market placement.
ISO 13485
The ISO 13485 standard concerns quality management systems for medical devices. It is a strong signal of industrial reliability and process control.
French manufacturing
Drugdiag® Toda Pharma tests distributed by AMA Prévention are designed in France, with traceability, customer support, and field expertise tailored to professionals' needs.
Warning: some imported tests show attractive prices but have limited traceability, poorly indicated thresholds, insufficient instructions, or information that is hard to verify. For serious use, these elements must be checked before purchase.
Drugdiag® Toda Pharma vs less sensitive THC tests: the clear comparison
To avoid hard-to-read tables on mobile, here are the essential criteria to compare before buying a THC saliva test.
Drugdiag® Toda Pharma
- Tests manufactured by a French laboratory
- CE marking
- Manufactured under ISO 13485 quality system
- Salivary THC threshold available at 15 ng/ml according to reference
- Solution suitable for professionals, businesses, institutions, and individuals
- AMA Prévention customer support and assistance in choosing the test
- Products used by demanding actors such as the French Army and SNCF according to relevant references
Competitor tests require increased vigilance
- THC threshold sometimes at 50 ng/ml, thus less sensitive for saliva THC
- Origin or manufacturer sometimes hard to identify
- Instructions, compliance, or documentation sometimes insufficient
- Limited or nonexistent customer support
- Risk of choosing a product unsuitable for the French context
- Difficult comparison if thresholds are not clearly displayed
Remember: a saliva test should never be chosen based on price alone. For THC, the threshold, compliance, origin, instructions, and support are decisive.
How to choose the right THC saliva test?
The right test depends on the use: self-monitoring, road safety, company, community, transport, high-risk professional environment, or occasional need. The 15 ng/ml threshold is particularly relevant when looking for a more sensitive THC saliva test consistent with the French road framework.
For an individual
A THC saliva test at 15 ng/ml is recommended for serious self-monitoring, especially when someone wants to check recent consumption before driving again or as part of personal prevention.
For a company
The choice of test must be consistent with the positions concerned, internal regulations, prevention obligations, confidentiality, and the chosen protocol. Testing must remain proportionate and controlled.
For transport
Driving professions, school transport, public transport, logistics, and security positions require special attention. The Joana Plan strengthens this prevention and testing approach in school transport.
Need a suitable THC saliva test?
AMA Prévention offers reliable, CE-certified saliva tests, made in France and adapted to the needs of individuals, companies, healthcare professionals, communities, and transport operators.
Company, road safety and Joana Plan: a major prevention topic
In companies, saliva testing must not be improvised. It must be part of a prevention policy, proportionate to the risks, concern truly sensitive positions, and comply with applicable internal rules.
Professional framework
- Identify safety or high-risk positions
- Include the terms in the internal regulations when necessary
- Inform employees and respect confidentiality
- Provide an appropriate dispute or confirmation procedure
- Never use the test as an arbitrary or humiliating tool
Joana Plan and school transport
The Joana Plan, announced in 2025, aims to strengthen school transport road safety. It notably focuses on awareness, prevention, screening, vehicle safety, user responsibility, sanctions, and control capabilities.
Important legal reference: the Council of State validated the principle of saliva tests in internal regulations under conditions, notably when the device is proportionate to the functions concerned and meets a safety objective.
Consequences of a poor test choice
Choosing a less sensitive or poorly documented test may seem economical at first, but the real cost can be high if the product is not suited to the usage context.
Risk of false sense of security
A 50 ng/ml THC test can be negative while a more sensitive 15 ng/ml test might have reacted. This can lead to misinterpretation of the risk.
Professional risk
In the workplace, a poorly chosen or poorly integrated test into the protocol can create tensions, disputes, or ineffective prevention in sensitive positions.
Road risk
A negative self-test never authorizes driving. The only completely safe driving is the absence of consumption of substances that can impair alertness.
Warning message: in case of a road check, official procedures and results from the legal framework prevail. A test bought online is a self-check and prevention tool, not a legal guarantee.
Frequently asked questions about THC saliva tests
Is a 15 ng/ml THC test more sensitive than a 50 ng/ml test?
Yes. For salivary THC, a 15 ng/ml threshold is more sensitive than a 50 ng/ml threshold. It can therefore detect lower concentrations.
Is the 15 ng/ml THC threshold the one used in the French road context?
The decree of December 13, 2016 sets the minimum THC detection threshold at 15 ng/ml of saliva for saliva screening under the Highway Code.
Does a negative saliva test allow driving?
No. A negative saliva test never authorizes driving. It can provide guidance but does not replace caution, abstinence from consumption, or official procedures.
Can a saliva test be used in the workplace?
Yes, under strict conditions. Screening must be proportionate, regulated, provided for in applicable rules, limited to relevant positions, and respect employees' rights.
Does the THC saliva test also detect CBD?
The test detects THC, not CBD itself. However, some CBD products may contain traces of THC that can be detected depending on the amount consumed, frequency, actual product composition, and test sensitivity.
Should you choose a 5-drug test, 6-drug test, or THC-only test?
It depends on the goal. To detect only cannabis, a THC-only test may suffice. For broader screening, a multi-drug test can detect THC, cocaine, amphetamines, methamphetamines, MDMA, opiates, or benzodiazepines depending on the reference.
Conclusion: for saliva THC, the 15 ng/ml threshold is the most consistent choice in France
The detection threshold is one of the most important criteria when choosing a THC saliva test. A 15 ng/ml test is more sensitive than a 50 ng/ml test and is closer to the threshold set by French regulations for saliva THC in road use.
For individuals, companies, healthcare professionals, local authorities, and transport actors, the right choice depends on several factors: appropriate threshold, CE marking, reliable manufacturing, clear instructions, serious support, and understanding the test’s limitations.
The Drugdiag® Toda Pharma tests distributed by AMA Prévention follow this logic: reliable, certified devices, made in France and designed for rigorous prevention.
Road safety reminder
Driving under the influence of drugs exposes you to serious risks: accidents, penalties, license suspension, prosecution, and endangering others. If in doubt, do not drive.
Official sources and useful resources
- Légifrance — Order of December 13, 2016, setting the modalities for drug screening under the Highway Code
- Council of State — Decision No. 394178 of December 5, 2016, on saliva tests in the workplace
- Ministry of the Interior — Joana Plan for strengthening school transport road safety
- AMA Prévention — Drugdiag® saliva tests
- AMA Prévention — Quote request for companies and professionals
Scientific validation of B-SAFE
The B-SAFE project, a drug detector pen for drinks, is validated and supported by Professor Jean-Claude Alvarez, toxicologist, professor of pharmacology-toxicology, and director of the toxicology laboratory at CHU Raymond-Poincaré/AP-HP in Garches.
A leading authority in toxicology, he is associated with the reference work conducted in France on psychoactive substances and chemical submission, in a national ecosystem also supported in public debate by voices such as Sandrine Josso and Caroline Darian.
This validation strengthens B-SAFE's technological positioning and the accuracy of its detection for drug prevention in drinks. Discover the B-SAFE product sheet.
