Dallas DWI Attorney

Blood Sample Errors

When a blood sample is drawn to test whether an individual has been driving under the influence of some substance, whether it be alcohol or a drug of some type, the blood must be handled correctly by an authorized individual.

The blood drawn should be drawn into a vile that contains an anticoagulant and a preservative of some type. The preservative is very important, for the same reason that preservatives are used in food. Without an adequate amount of the preservative in the blood sample, the blood can go bad, just like food does.

When food goes bad, it may develop a funny smell or grow mold. When a blood sample goes bad, it begins to ferment. When the blood ferments, it releases alcohol into the rest of the blood in the vial. This alcohol is registered as “alcohol” in the blood test. It does not show up as “alcohol from fermenting blood sample.”

Because of the inability of a machine to determine the source of alcohol in a blood sample, an improper amount of preservative can be a serious problem for any individual who has given a blood sample. Fortunately, there are a number of ways to prove that a person’s blood sample was contaminated by alcohol from fermentation, as opposed to ingested alcohol.

If the vial for the blood sample does not have enough of the anticoagulant in it, the blood sample will begin to clot. This will leave a larger amount of alcohol in a smaller quantity of liquid leaving the suspect with something of a false positive.

Contact a Dallas DWI Lawyer

If you have been charged with a DWI and feel that there has been an error or would like to know more about blood test procedures, contact the Dallas DWI lawyers of the Law Office of Mark T. Lassiter at (214) 845-7007.


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