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Breath & Blood Testing Answers

Defend Your Innocence in Collin, Dallas & Tarrant Counties

Blood and breath testing are very complicated components of DWI law, and it takes a lot of education to fully understand how they work. Once you know how they work, you know how inaccurate and unreliable they can truly be. If you have been charged with DWI, it is important to get the help of a Plano criminal defense lawyer with experience to help you obtain the best possible outcome for your case.

Dial (214) 855-7737 now or contact the Wilder Law Firm online to schedule your free consultation.

Below you will find answers to commonly asked questions about DWI. Feel free to reach out to the Wilder Law Firm with questions you cannot find answered here.

  • How accurate are chemical DWI tests in North Texas?

    Urine testing is the least accurate method and is rarely ever performed. The scientific community regards blood testing as the most accurate method of measuring blood alcohol concentration, but it is inconvenient for police. Breath testing is more convenient for police, but its reliability and accuracy have been debated.

  • How is breath testing performed in Texas?

    The state of Texas uses the Intoxilyzer 5000, more commonly referred to as a breathalyzer. This machine costs about $7,500 and lasts about 10 years before it needs to be replaced. It functions on the theory of infrared spectroscopy, or the absorption of infrared light. Alcohol absorbs specific wavelengths of light, and the machine is supposed to only detect these wavelengths.

  • How reliable is a Texas breath test?

    The most common argument against breath testing is that the machine might misread other substances similar to alcohol. However, no one but law enforcement is allowed to test the machine for reliability and accuracy. Additionally, other factors can affect results. For example, a sober person with a fever will have a higher breath test reading than they would without a fever. Bottom line: these machines are fast and cheap, but they have a lot of problems.

  • Should I agree to a chemical test?

    First, ask the officer for permission to call a lawyer. He probably will not let you. Be polite and courteous, and maintain that you need to speak with a lawyer before deciding whether or not to take the test. Eventually, the officer will tell you that if you keep asking to speak with a lawyer, he’ll tell you your actions constitute a refusal. This helps set the stage for a jury trial.

    If you fail the test, you’ll be charged. If you pass the test, you could still be charged. If you refuse the test, you’ll be charged. It’s a lose-lose-lose situation. However, if you pass the test, you won’t lose your drivers’ license.

  • Can I choose a blood test instead of a breath test?

    The officer has the choice of which test to offer. You may request a blood test, but they do not have to give you one. However, the Texas State Code states that you may obtain an independent blood test within two hours of your arrest.

  • Can a Dallas police officer force me to take a chemical test?

    You are only obligated to take a chemical test if there has been an accident resulting in death or likely death.

  • What happens if I refuse a chemical test in Texas?

    A person arrested for DWI may refuse a requested test.

    This can result in the following penalties:

    • 180-day suspension of your driving privilege on first DWI arrest
    • 2-year suspension of your driving privileges for a subsequent arrest within 10 years if you also refused to submit to a test in your first arrest
    • The prosecutor can admit your refusal into evidence in your DWI trial, then argue that you refused the test because you knew you were intoxicated and that you would fail

    If you fail the chemical test, you’ll face:

    • 90-day suspension of your driving privilege if your driving record shows no prior alcohol-related arrests
    • 1-year suspension of your driving privilege if you have a prior conviction or suspension within the preceding 10 years
    • The prosecutor can admit the results of the test into evidence at your DWI trial

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