Assuming proper storage, how long can a blood sample be stored before it becomes unusable for BAC testing?

Asked almost 2 years ago - Los Angeles, CA

First venipuncture on right arm failed to extract any blood. Therefore, the tech venipunctured left arm to collect blood sample for BAC testing. The sample was collected 5 months ago.

Attorney answers (3)

  1. Robert Lee Marshall

    Contributor Level 20


    Lawyers agree

    Answered . If the proper amount of preservative is present and the sample tube is undamaged, it can remain usable for years. Five months should be no problem.

    Please understand that this is a general discussion of legal principles by a California lawyer and does not create... more
  2. Pius Joseph


    Contributor Level 14


    Lawyers agree

    Answered . You can hire an attorney.The attorney can retain a forensic toxicologist to challenge the protocol, retest the blood and formulate a viable defense.

  3. Richard Gaxiola


    Contributor Level 9


    Lawyers agree

    Answered . I would contact a local attorney for advice. Typically, most DUI attorneys hire their own expert to challenge blood evidence. There are a few national manufactures that produce the tubes wherein blood is stored for testing. These tubes have preservatives that claim to slow the process of contamination of the blood. However, there are always issues to challenge. Good luck.

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