What is retrograde extrapolation?
Retrograde extrapolation is the scientific and mathematical process used by chemists and toxicologists to estimate what a person's blood alcohol content was at a specific time based on test results obtained at a later period of time.
Why is it important?
Retrograde extrapolation is important because it can be used to determine blood or breath alcohol level at the time of an arrest. You are arrested for DUI, and taken to the police station for booking. While at the station, according to RCW 46.61.502 the police are required to administer a breathalyzer within 2 hours. If they are requesting a blood alcohol test, the test would be performed at a hospital and it is required to be taken within 2 hours of the arrest.
How does it affect you?
Once arrested and charged with a DUI, retrograde extrapolation can help the attorney determine your breath/blood alcohol content by using the scientific formula to determine what your actual breath/blood alcohol level was at the time of the arrest. There are several factors that are involved with determining your blood or alcohol content. Your body processes the alcohol that is ingested, and at the time of the arrest there is not a way to determine if your blood alcohol level has peaked or if the alcohol level has started its decent. Prosecuting attorney’s use the retrograde extrapolation formula to build their case against you and defense attorneys attempt to use it to establish a defense in your DUI case.
What is the next step?
Rick is an experienced DUI attorney, and if you have been arrested for driving under the influence it is important that you speak with an attorney that is familiar with the DUI laws in Washington State. Understanding that retrograde extrapolation could be used against you, it is important to have an attorney that can defend your case with the potential of the prosecuting attorney using retrograde extrapolation.
Give us a Call
If you find yourself in the unfortunate situation of receiving a DUI, please don’t hesitate to give Rick a call. He is an experienced DUI attorney and has been handling DUI cases since 1992.
If you’ve just been pulled over or have received a DUI and would like Rick to represent you - give us a call or drop us an email, we’ll get right back to you.
If you have any questions at any time throughout the process you can always call and ask the office - we are more than happy to help.
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