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Are Breathalyzer Tests Always Accurate?

Breathalyzer tests are commonly used to determine a person's blood alcohol concentration (BAC) levels. However, the accuracy of these tests has been debated for years.

It's important to understand the science behind these tests to defend DUI cases. In this blog post, we'll explore the accuracy of breathalyzer tests and provide tips on what to do if you or a loved one is facing a DUI charge based on a breathalyzer test.

The Science Behind Breathalyzer Tests

Breathalyzer tests work by measuring the amount of alcohol in a person's breath and converting it into a BAC level. However, there are several factors that can affect the accuracy of these tests:

  • The type of breathalyzer machine used
  • The temperature of the breathalyzer
  • The way the test is administered

Additionally, certain medical conditions and medications can also affect the accuracy of breathalyzer tests. For example, people with acid reflux or those taking certain types of medication may produce false positives on breathalyzer tests.

While Breathalyzer tests can be accurate under perfect conditions, these situations are rare. This doesn't mean all Breathalyzer tests are always inaccurate, but there's a lot more complexity to the results than people typically expect.

Attacking the Credibility of a Breathalyzer Test

If you or a loved one is facing a DUI charge based on a breathalyzer test, a criminal defense attorney can help by attacking the credibility of the Breathalyzer results.

Here are some ways an attorney can help you defend against your DUI charges:

  • Challenge the accuracy of the machine: Breathalyzer machines must be calibrated regularly to ensure accuracy. If you believe the machine used in your case was not properly calibrated, you can challenge the results of the test.
  • Challenge the administration of the test: If the person administering the test was not properly trained or did not follow proper procedures, the results of the test may be called into question.
  • Challenge the conditions in which the test occurred: Things such as temperature, certain medications, and certain medical conditions can result in a Breathalyzer false positive.


Breathalyzer tests are not always accurate and can be affected by a variety of factors. When the evidence against you hinges on a bad Breathalyzer test, there's a chance you can beat your DUI charges.

If you or a loved one is accused of DUI, contact the Law Office of Steven Fine for experienced legal representation.