Are DWI Blood Tests Always Accurate?

 Posted on September 06, 2023 in Criminal Defense

Blood tests in DWI (Driving While Intoxicated) cases can play a critical role in determining a person’s level of alcohol or drug impairment while operating a vehicle. These tests are generally regarded as being more accurate than breathalyzer tests. However, it is essential to understand that blood tests are not always flawless, and there may be instances where their accuracy is called into question. If you have been charged with DWI and a failed blood test is relevant to your case, understand that you have legal options to pursue at this time. Contact an attorney to understand how best to move forward to fight the charges and clear your name, as Texas law treats DWI offenses very seriously. 

Collection and Storage Procedures 

One of the crucial factors that can affect the accuracy of DWI blood tests is the collection and storage procedures. Proper protocols must be followed during the collection process to ensure the integrity of the sample. Mishandling, contamination, or improper blood sample storage may lead to inaccurate test results. Therefore, adherence to strict collection and storage procedures is crucial to maintain the blood test’s accuracy. 

Lab Analysis 

The laboratory analysis of the blood sample is another essential aspect that can impact the accuracy of DWI blood tests. The testing process involves complex scientific techniques, and errors can occur during this process. Factors such as faulty equipment, inexperienced technicians, or inadequate quality control measures can compromise the accuracy of the test results. It is essential that the lab conducting the analysis follows standardized protocols and maintains high-quality control standards to minimize the risk of errors.

Timing of Blood Collection

Alcohol absorption and elimination rates can vary substantially among individuals, and the concentration of alcohol in the blood can change over time. Suppose the blood sample is collected significantly later than the time of the alleged offense. In that case, the test results may not accurately reflect the individual’s impairment level at the time of driving. Defense attorneys often challenge the timeliness of blood collection to question the accuracy of the test results. 

Medical Factors and Interferences

Certain medical conditions and medications can potentially affect the accuracy of DWI blood tests. Some medical conditions may lead to elevated blood alcohol levels, even without consuming alcohol. Additionally, certain medications can interfere with the accuracy of test results. It is crucial for individuals to inform the testing authorities about any medical conditions or medications they are taking that could potentially impact the blood test results. 

Contact a Collin County DWI Attorney

For attorneys who know the ins and outs of DWI blood testing, contact the skilled Plano DWI lawyers with Law Offices of Biederman & Burleson P.L.L.C.. Call 469-333-3333 for a free consultation.