State v. Eighth Judicial District Court ex rel. County of Clark

OPINION

By the Court,

Douglas, L:

In this original writ proceeding, we consider the admissibility of retrograde extrapolation evidence to estimate a defendant’s blood alcohol level at a point in time based on a blood sample taken at a later point in time. We conclude that although retrograde extrapolation evidence is relevant in a prosecution for driving under the influence, under certain circumstances such evidence may be unfairly prejudicial and therefore inadmissible. Because the prosecution in this case had to rely on the results from a single blood *930sample and a number of the factors that…