Causes of Breathalyzer Failure

When a person is stopped by a police officer under suspicion of driving while intoxicated, they are usually asked to submit to a breathalyzer test in order to objectively determine their blood alcohol content (BAC) at the time of the stop. Although there are other factors that police can use to determine if a DWI charge should be levied against a person, a person’s BAC is typically the basis on which a DWI charge is constructed. Breathalyzers are supposed to provide a clear, accurate indication of BAC; unfortunately, the reality is that many breathalyzer results are prone to error.

In spite of the widely documented problems associated with breathalyzer use in determining whether or not an individual is actually intoxicated, law enforcement officials continue to use BAC results as the basis for arresting drivers who are suspected of driving while intoxicated. In order to combat this situation, it is often necessary to pursue the services of a qualified legal professional to uphold the individual’s rights.

Common Causes of Breathalyzer Failure

There are a number of different reasons why breathalyzer results may be inaccurate, but the following are particularly common:

  • Inaccurate device calibration
  • Residual alcohol in mouth
  • Differences in weight of users
  • Ambient temperature

These are just some of the many different problems that can cause breathalyzer failure, and may lead to a person being unfairly charged with a DWI.

Contact a DWI Lawyer in San Antonio

If you have been accused of a DWI or DUI, you need an attorney on your side to help defend you against this damaging charge. From determining whether the breathalyzer test was done properly and accurately to using other defense options, our lawyers at can help you. Get in touch with us by calling (210) 698-3533 today and find out more about how we can fight for you.