Saliva test: Cannabis (THC)

Saliva test: Cannabis (THC)

NarcoCheck NarcoCheck



Saliva test for cannabis (THC) screening. Designed for the detection of recent cannabis use and road safety (preventive self-screening before driving).

One of the only tests in the world to detect the molecule of cannabis specific to saliva (the one currently sought by the Police).

The last generation of saliva tests!

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This saliva test is intended for the screening of cannabis (THC).

Simple, very reliable, and exceptional value for money.


With the NarcoCheck® Saliva test: the detection is done on the Δ9-THC, which is the molecule of cannabis that is found specifically in the mouth, because it is contained in the smoke of cannabis cigarettes. When a person smokes a joint, this smoke will contaminate the mouth and leave traces for several hours. It is these traces, the same as those sought by the Police, that our saliva test will detect. It is no longer a modified urine test, but a real innovation in salivary screening.

With the classic tests: current saliva tests are, for the most part, designed to detect in the saliva the same traces of cannabis as in the urine. However, several scientific studies have shown that barely no amount of this molecule (THC-COOH) is found in the saliva. As a result, a too high rate of false negatives is observed (the test is negative whereas it should be positive).

What does this test detect?

This saliva test detects Δ9-THC, which is the psychoactive substance of cannabis.

A cannabis joint (marijuana, hashish etc.) contains millions of molecules of Δ9-THC.

What exactly is showing this test?

It will show a positive result when the person tested has a concentration of pure THC in the mouth greater than 25 nanograms per milliliter of saliva.
He will then say whether or not the person tested has used cannabis for the last 4 to 6 hours.

A new essential tool for road safety!

Small and very simple to use, this test is perfectly suited to self-screening. Cannabis users can now reduce the risk of using marijuana or hashish by testing themselves.

The benefits of saliva tests:

  • They are very simple to use and minimally invasive.
  • They can be used anywhere, at any time.
    No need for bathroom or special amenities.
    Saliva is immediately accessible.
  • They can be used to detect drug consumption immediately after taking, long before traces of drugs can appear in the urine, and last for several hours.
  • They are done in front of you, which makes them very difficult to falsify or adulterate. Salivary tests reduce the potential for cheating.

Ideal to determine if the subject is still under the influence of cannabis.

A cannabis joint usually has effect for 4 to 6 hours. As this salivary test detects cannabis use dating less than 6 hours, a positive result will logically allow us to envisage a current state of cannabic intoxication.

The principle is simple:

1 - Place the collector in the mouth until thoroughly soaked

2 - Put the collector
into the tube

3 - The test starts automatically. Wait 10 mn.

4 - Read the results.

2 letters are written on the white cassette:

C = control line; It must always be present otherwise the test is invalid.

T = test line for THC (cannabis)

When 2 red lines appear, the test is negative.

When only one line appears, the test is positive.

When no line appears next to line C, the test is invalid.

This test is negative

Test négatif pour toutes les drogues

This test is positive

Test positif pour les Amphétamines et le cannabis.

This test is invalid

Test invalide

What is the difference between Δ9-THC and THC-COOH?

The Δ9-THC (pronounced "delta 9 THC") is the name used in the raw cannabis molecule, as it is found in hashish or weed (marijuana).

Once smoked or ingested, the human body must modify this molecule in order to eliminate it. It transforms it into a sub-molecule, which will be found especially in the urine: THC-COOH (also called 11-nor-Δ9-THC-COOH).

Why is it important to judge the performance of a saliva test?

Because in the mouth, the Δ9-THC is massively found.
On the other hand, barely no traces of THC-COOH are found, which becomes virtually undetectable after a few tens of minutes after smoking a joint.

To effectively detect cannabis, a saliva test must therefore be calibrated to detect Δ9-THC.

The problem is that most current salivary tests are modified urine tests, and therefore detect THC-COOH. Even at very low detection thresholds such as 12ng/ml, they become ineffective in less than an hour after the last smoked joint.

A test will therefore be much more effective in detecting Δ9-THC at 25 ng/ml than detecting THC-COOH at 12 ng/ml !

Can a saliva test replace a urine test?

No, simply because it is not made for that.

Saliva tests are actually very effective where urine tests are not at all effective. Traces of cannabis can be detected in the saliva almost immediately after its consumption, whereas it is often necessary to wait more than ten hours to see traces in the urine.

Salivary screening will thus be fully effective over a period of a few hours following drug use. This period can be more or less long depending on the metabolism of people and their level of consumption.

A saliva test can tell: "The person tested used cannabis less than 6 hours ago".

A urine test can tell: "The person tested has used cannabis in the past few days" or "The person tested consumes cannabis (more or less regularly)".

Each type of test therefore has its specificity and none can replace the other.

Data sheet

Test typeSaliva
ReliabilityExcellent. One of the most reliable tests currently available
Results in10 minutes
Detection time4 to 6 hours after cannabis use
Cut-off (detection standard)--Multiple-- More details Less details

Cut-off details

NarcoCheck® Saliva test : Cannabis

Substancesconcentration (ng/ml)
Δ9-THC *25 ng/ml

* Native THC molecule (also called "THC parent"), exactly as it is found in saliva.