Relationship between blood and urine alcohol concentrations in apprehended drivers who claimed consumption of alcohol after driving with and without supporting evidence

Forensic Science International : Synergy
Alan Wayne Jones, Fredrik C Kugelberg

Abstract

For various reasons, many people suspected of driving under the influence of alcohol (DUIA) are not apprehended sitting behind the wheel, but some time after the driving. This gives them the opportunity to claim they drank alcohol after the time of driving or after they were involved in a road-traffic crash. Alleged post-offence drinking is not easy for the prosecution to disprove, which often means that the DUIA charge is dropped or the person is acquitted if the case goes to trial. The routine practice of sampling and measuring the concentration of alcohol in blood (BAC) and urine (UAC) and calculating urine/blood ratios (UAC/BAC) and the changes in UAC between two successive voids furnishes useful information to support or challenge alleged drinking after driving. We present here a retrospective case series of DUIA offenders (N=40) in half of which there was supporting evidence of an after-drink (eye witness or police reports) and in the other half no such evidence existed apart from the suspect's admission. When there was supporting evidence of an after-drink, the UAC/BAC ratio for the first void was close to or less than unity (mean 1.04, median 1.08, range 0.54-1.21) and the UAC increased by 0.21 g/L (range 0.02-0.57) bet...Continue Reading

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Apr 28, 2009·Forensic Science International : Synergy·Alan Wayne Jones, Anita Holmgren

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Citations

Jul 23, 2014·Forensic Science International : Synergy·Laís Helena Picolo BuenoBruno Spinosa De Martinis
Sep 29, 2011·Forensic Science International : Synergy·M SimicM Djurendic-Brenesel
Nov 12, 2015·Forensic Science International : Synergy·Gudrun HøisethJørg Mørland
May 3, 2011·Analytical Chemistry·T A BrettellJ R Almirall

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