Falsification of saliva tests: myth or reality?

Why is this guide essential?

The saliva drug test is today the reference tool for detecting the consumption of narcotics , in particular THC (cannabis), cocaine, amphetamines, methamphetamines and opiates .

It is used in many contexts:

• Saliva test by the gendarmerie and police during road checks
• Saliva testing for narcotics in companies to ensure workplace safety
• Drug screening in schools and educational settings
• Parental control of young people to prevent drug-related risks

📌 But is it possible to fake a THC saliva test?

📌 Do some products like Kleaner or saliva test-preventing mouthwashes actually work?

📌 How can employers, police, and parents prevent fraud attempts?

Some products like Kleaner or homemade techniques claim to help bypass a saliva narcotics test , posing a real challenge for:

• ✅ Employers (in-company screening)
• ✅ HR managers and security managers
• ✅ Educators and school principals
• ✅ Concerned parents
• ✅ Law enforcement (national police, gendarmerie, municipal police, customs)
• ✅ Prevention and security agents
• ✅ Event organizers and private security services
• ✅ Transport and logistics professionals

➡️ This guide reveals the main fraud attempts and solutions to ensure reliable screening.

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🔎 1. Methods used to falsify a saliva drug test

📌 The most common techniques for circumventing saliva screening

✅ Anti-saliva test chemicals: Kleaner, sprays, mouthwashes
➡️ Products like Kleaner claim to remove traces of THC, cocaine, MDMA, and other drugs in minutes.
➡️ Some people use alcohol or peroxide mouthwashes to mask the presence of narcotics.

✅ Dilution and rinsing
➡️ Drinking plenty of water , rinsing your mouth with lemon juice, vinegar or milk is a common technique.

✅ Synthetic saliva or stored saliva
➡️ Some try to use fake saliva or a clean sample stored in advance.

✅ Chew gum, activated charcoal or suck on menthol candies
➡️ Some believe this masks the presence of drugs in saliva.

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💡 2. Why don't these methods work?

New generation saliva tests , such as Drugdiag® Saliva , are designed to detect any attempt at manipulation .

📌 1. The C control bar: a guarantee of reliability
➡️ Each saliva drug test has a C (Control) bar that is only activated if the test is operating under optimal usage conditions .
➡️ If the C bar is not displayed, the test is invalid , which means that the saliva has been altered or a masking product has been used .
➡️ Products like Kleaner or saliva test-preventing mouthwashes cannot prevent C-bar activation, making these methods ineffective.

📌 2. Detection of masking products and diluted samples
➡️ Anti-cheat saliva tests react to attempts to dilute or use synthetic saliva .
➡️ Saliva that is too clear, too fluid or contains chemical residues can be detected.

📌 3. Resistance to neutralizing substances
➡️ Broad spectrum saliva tests , such as Drugdiag® Saliva Innovation , are designed to withstand the chemicals most commonly used to mask narcotics.
➡️ Even after intensive rinsing, the presence of THC, cocaine, amphetamines, methamphetamines or opiates can be detected several hours after consumption .

📌 4. Carry out a second saliva test in case of doubt
➡️ If a narcotics saliva test seems suspicious , a second test can be performed immediately.
➡️ This complicates any attempt at fraud, because masking products have a very short duration of action.

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🚨 3. How to spot an attempted fraud?

👀 Warning signs
📌 Suspicious behavior :

• Looking to save time before the test
• Asks for a drink or to rinse your mouth
• Hides an object in his hands or pocket

📌 Physical clues :

• Abnormal odor (alcohol, chemicals)
• Excessively clear or foamy saliva (signals recent mouthwash)
• Excess salivary secretion

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✅ 4. How to avoid falsification of a THC saliva test?

🕒 1. Wait 15 to 25 minutes before testing

A saliva drug test should be performed after waiting 15 to 25 minutes , without drinking, eating, smoking, or rinsing the mouth.

👀 2. Strict supervision of the saliva test

🚨 Never leave the person alone before or during the test.
🚨 Make sure she doesn't put anything in her mouth (candy, spray, chewing gum).

🧪 3. Use a second saliva test if in doubt

👉 Anti-cheating solution: perform a second saliva test immediately if suspected.

🔬 4. Choose a reliable saliva test

Use tests made in France, CE and ISO 13485 certified , recognized for their accuracy, such as Drugdiag® Saliva Innovation or Saliva THC (Cannabis), Saliva 5+ or Saliva 6+ .

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🔥 Conclusion: Vigilance, the key to reliable screening

🚨 Yes, there are methods to try to falsify a THC or multi-drug saliva test , but they remain ineffective in the long term .

👉 Waiting 15-25 minutes, supervising the test, and performing a second saliva test if in doubt are the best precautions against fraud.

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