Blood Testing – Glendale Arizona DUI Attorneys

Have you been charged with DUI in Arizona?  Have you consulted with an experienced Glendale Arizona DUI attorney concerning your blood test?

If you’ve been charged with DUI in Arizona there is a good chance you had to submit to a blood test.  Blood testing is the growing trend for DUI investigations in Arizona as it is more accurate and less prone to attack than breath testing.  It used to be the case that blood was drawn by medical personnel at hospitals, but it’s becoming more common that police officers are obtaining phlebotomist credentials so they can draw blood on the scene.  Although blood testing is more accurate than breath testing, it is still subject to errors and should be carefully evaluated by an experienced DUI lawyer in Glendale.

Possible Errors with Blood Test Results

Blood Draw:  The person who draws blood for the DUI investigation must be trained to do venipuncture/blood withdrawal.

Whole Blood or Plasma:  What was tested, whole blood or plasma/serum?  Results could be inflated if only blood serum or plasma was used instead of whole blood.

Hematrocrit:  If you have a higher hematrocrit (percentage of your whole blood made up of cellular material), you’re going to show a higher BAC because you have a lower volume of liquid.

Alcohol:  Rubbing alcohol may have contaminated the blood sample.

Blood Test Kits:  The NIK kit may have expired.

Vacuum Tube:  A vacuum in the tube exists to insure that a precise amount of blood is drawn and mixed with preservative and an anticoagulant.  If the vacuum tube was malfunctioning contaminants such as yeast, alcohol or microbes may have been present thereby altering the results.

Preservative:    The lab adds a chemical to pull the alcohol out of liquid and turn it into vapor, known as salting out.  The higher concentration of salting out agent the higher the BAC.  If too much salting out chemical was used, the results could be inaccurate.

Chain of Custody:  If there is a break in the chain of custody it most likely will not prevent the results from coming into evidence at trial, but it may be used to show that the blood results should not be taken seriously.