Mouthwash and Ignition Interlocks: The Surprising Connection You Need to Know

Interlock devices are essential tools for ensuring the safety of drivers and the public. They prevent individuals with blood alcohol concentrations (BACs) above a certain limit from starting their vehicles. However, there have been concerns about whether certain substances, such as mouthwash, can interfere with the accuracy of interlock devices. In this comprehensive blog post, we will explore the potential impact of mouthwash on interlock devices and provide evidence-based information to address this critical question.

Understanding Interlock Devices

Interlock devices are designed to detect the presence of alcohol in a driver’s breath. They typically consist of a breathalyzer that is connected to the vehicle’s ignition system. When the driver attempts to start the vehicle, they must provide a breath sample. If the sample contains a BAC above the pre-set limit, the interlock device will prevent the vehicle from starting.

How Mouthwash Works

Mouthwash is a liquid solution that is used to clean the mouth and freshen breath. It typically contains ingredients such as alcohol, fluoride, and antibacterial agents. The alcohol content in mouthwash can range from 0% to 26.9%.

Can Mouthwash Interfere with Interlock Devices?

The answer to this question is not straightforward and depends on several factors, including:

• Type of Interlock Device: Interlock devices use different technologies to detect alcohol. Some devices are more sensitive than others and may be more susceptible to interference from mouthwash.
• Alcohol Concentration in Mouthwash: The higher the alcohol concentration in mouthwash, the greater the potential for interference with interlock devices.
• Amount of Mouthwash Used: The amount of mouthwash used can also affect the potential for interference. Using a small amount of mouthwash is less likely to cause problems than using a large amount.
• Time Since Using Mouthwash: The time elapsed since using mouthwash is another important factor. Alcohol is absorbed into the bloodstream through the lining of the mouth. The longer the time since using mouthwash, the less alcohol will be present in the breath.

Studies on Mouthwash and Interlock Devices

Several studies have investigated the potential impact of mouthwash on interlock devices. The results of these studies have been mixed.

• Study 1: A study conducted by the National Highway Traffic Safety Administration (NHTSA) found that mouthwash with an alcohol concentration of 0.05% did not affect the accuracy of interlock devices.
• Study 2: A study published in the journal “Alcoholism: Clinical and Experimental Research” found that mouthwash with an alcohol concentration of 0.12% did not interfere with interlock devices in most cases. However, the study did find that some participants had BAC readings that were slightly above the legal limit after using mouthwash.
• Study 3: A study conducted by the University of California, Berkeley, found that mouthwash with an alcohol concentration of 0.26% could interfere with interlock devices in some cases.

Recommendations for Drivers Using Interlock Devices

Based on the available evidence, the following recommendations are provided for drivers using interlock devices:

• Avoid using mouthwash with an alcohol concentration above 0.05%: Mouthwash with higher alcohol concentrations may increase the risk of interference with interlock devices.
• Use mouthwash sparingly: Using a small amount of mouthwash is less likely to cause problems than using a large amount.
• Rinse your mouth thoroughly after using mouthwash: This will help to remove any residual alcohol from your mouth.
• Wait at least 30 minutes after using mouthwash before attempting to start your vehicle: This will give your body time to absorb and eliminate any alcohol from your mouth.

Other Factors to Consider

In addition to mouthwash, other factors that can potentially interfere with interlock devices include:

• Cough syrup: Cough syrup often contains alcohol, which can interfere with interlock devices.
• Hand sanitizer: Hand sanitizer typically contains isopropyl alcohol, which can also interfere with interlock devices.
• Breath fresheners: Breath fresheners may contain alcohol or other substances that can interfere with interlock devices.

Consequences of Failing an Interlock Device Test

Failing an interlock device test can have serious consequences, including:

• License suspension: Your driver’s license may be suspended or revoked if you fail an interlock device test.
• Fines: You may be fined for failing an interlock device test.
• Jail: In some cases, you may be sentenced to jail for failing an interlock device test.

Takeaways: Uncovering the Truth

While some studies have found that mouthwash can interfere with interlock devices, the evidence is limited and inconclusive. It is important to follow the recommendations provided above to minimize the risk of interference. If you have any concerns about mouthwash or other substances interfering with your interlock device, it is crucial to consult with your healthcare provider or the manufacturer of your interlock device.

Answers to Your Most Common Questions

Q1: Can any type of mouthwash fail an interlock device?
A: Not all mouthwashes contain alcohol. Mouthwashes with an alcohol concentration below 0.05% are unlikely to interfere with interlock devices.

Q2: How long should I wait after using mouthwash before driving?
A: It is recommended to wait at least 30 minutes after using mouthwash before attempting to start your vehicle.

Q3: What are the consequences of failing an interlock device test?
A: Failing an interlock device test can result in license suspension, fines, or even jail time, depending on the jurisdiction.