Blood tests are widely considered to be the most accurate of the chemical BAC testing methods used by law enforcement in DUI cases. Analysis of your blood allows investigators the closest glimpse possible into the way your body was metabolizing alcohol (if there was indeed alcohol in your system) at the time you were stopped.
How the Blood Test Works
After you have been arrested for DUI, the officer will test your breath, blood or urine to determine your blood alcohol content, or BAC. For most drivers, a BAC of .08 is the legal limit; lower limits apply for commercial drivers (.04), impaired drivers -DWI (.06) and underage drivers (0.02).
If the officer decides to test your blood, it will be taken either at the police station or at a hospital. If you refuse to submit to the test, the officer should secure a warrant before your blood is drawn.
The blood sample is then sent to a laboratory where it will be analyzed. Your results will be shared with the state as the case against you proceeds.
Science and Errors
While the science behind blood tests is sound, there are myriad ways a blood sample can become contaminated, procedures are not followed, machines are not working properly, improper equipment is used and human error are but a few of the issues which will render the results of the test inadmissible in a DUI case. An experienced DUI attorney will know what to look for in investigating the circumstances that led up to your blood being taken and how to use that information to your advantage in your case.
A Simple Process to Getting Started

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