Retrograde Extrapolation

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Definition of Retrograde Extrapolation

Law enforcement may use retrograde extrapolation to scientifically calculate a driver's blood alcohol concentration or BAC when they were actually driving. Retrograde extrapolation requires assumptions about the driver's alcohol consumption, the volume of alcohol consumed, the absorption rate of the alcohol and the alcohol elimination rate. Defense attorneys will argue that the prosecutions attempt to use retrograde extrapolation to determine the driver's BAC at the time they were driving is inaccurate due to the multitude of assumptions which must be used in the calculation.

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