What does "relations back" mean when BAC exceeds the 2 hour limit?

Asked over 1 year ago - Peoria, AZ

BAC in DUI was taken 2 hrs, 35mins later, which exceeds the 2 hr limit, per law. Public Defender say it doesn't matter because there is something called "relations back", which mean they could of taken it 4-5 hrs later.

Attorney answers (3)

  1. Aaron Michael Black


    Contributor Level 15


    Lawyers agree

    Answered . There are also some issues with relation back testimony in AZ due to the fact AZ is now a Daubert state. There may be some legal arguments to make depending in the method used by the state's expert to do the retrograde

  2. Ted Harvatin


    Contributor Level 20


    Lawyers agree

    Answered . Reverse extrapolation. They take your BAC at the time of the test and related it back to what it would have been earlier.

  3. Jasen Bodie Nielsen


    Contributor Level 19


    Lawyers agree

    Answered . This refers to the method by which a forensic toxicologist attempts to calculate what your BAC was at the time of driving. I'd suggest consulting with a private DUI attorney in AZ about your case, as it might give you a better chance of winning. Good luck.

    Jasen Nielsen

Related Topics


The definition, charges, and penalties for driving under the influence (DUI) vary by state and depend on a number of factors.

DUI arrest

A DUI arrest must be based on probable cause: the officer must have enough evidence to arrest, as determined by a combination of factors.

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