24 Hour Toll Free Help

Retrograde Extrapolation

« Back to Glossary

Definition - What does Retrograde Extrapolation mean?

Retrograde extrapolation is a scientific method which attempts to calculate a driver's blood alcohol concentration or BAC when they were actually driving. By using scientific principles and reasonable assumptions about the driver's 1) absorption rates, 2) alcohol consumption, 3) volume of alcohol consumed, 4) the drinking time and the 5) elimination rates of the driver, the driver's BAC level at the time they were driving may be estimated by using retrograde extrapolation.

Critics of retrograde extrapolation however, claim that this method of estimating the driver's BAC at the time of driving is far from a scientific certainty and is instead no more than an estimate that may be in error because it allows for the calculations to be done with a multitude of assumptions that the defense will claim are not true.

Related Links

  • Against Retrograde Extrapolation -- Five Reasons Retrograde Extrapolation Should Not Be Allowed In DUI Cases
  • BAC -- Blood alcohol concentration, defined by www.duiattorneyhome.com

« Back to Glossary

Browse DUI Terms Alphabetically:
A | B | C | D | E | F | G | H | I | J | L | M | N | O | P | R | S | T | U | V | W | Z | ALL