TY - JOUR
T1 - An analysis of alcohol breath tests results with portable and desktop breath testers as surrogates of blood alcohol levels
AU - Schechtman, Edna
AU - Shinar, David
N1 - Funding Information:
This study was funded by a grant from Israel's Road Safety Authority, Unit of the Chief Scientist. Partial results of this study were presented by the same authors at the T2010 ICADTS conference in Oslo, NO (25 August, 2010). We thank Kobi Peleg, Maya Siman-Tov, and Dana Jaffe for the data collection, and Shlomo Almog for his help in analyzing the blood samples for the BAC.
PY - 2011/11/1
Y1 - 2011/11/1
N2 - There is a perceived tradeoff between the ease of measuring alcohol in the body and the accuracy of the result. Direct tests of blood alcohol concentrations are considered the most accurate, desktop stationary breath testers based on electro-chemical infra-red technology are slightly less accurate, but accepted for evidentiary purposes in most jurisdictions, and quick portable breath testers based on fuel-cell technology are the easiest to administer but not acceptable in many courts. This study compared the accuracy of an evidentiary portable breath tester and an evidentiary desktop breath tester relative to blood alcohol concentrations. Inverse regressions were used to obtain confidence limits for the alcohol levels as read by the breath testers that would provide tradeoffs of false positives and false negatives for three levels of confidence: 95%, 96%, and 98%; corresponding to false positive values of 2.5%, 2%, and 1%, respectively. A decision tree model is offered for the optimal use of the three measures, so that portable breath testers can be sufficient for high level BrAC, stationary breath testers can be sufficient for medium level BrAC, and blood tests are recommended for still lower BrACs. The model provides quantitative BrAC threshold levels for the two most common BAC levels used to imply DWI: 50 mg/dl and 80 mg/dl.
AB - There is a perceived tradeoff between the ease of measuring alcohol in the body and the accuracy of the result. Direct tests of blood alcohol concentrations are considered the most accurate, desktop stationary breath testers based on electro-chemical infra-red technology are slightly less accurate, but accepted for evidentiary purposes in most jurisdictions, and quick portable breath testers based on fuel-cell technology are the easiest to administer but not acceptable in many courts. This study compared the accuracy of an evidentiary portable breath tester and an evidentiary desktop breath tester relative to blood alcohol concentrations. Inverse regressions were used to obtain confidence limits for the alcohol levels as read by the breath testers that would provide tradeoffs of false positives and false negatives for three levels of confidence: 95%, 96%, and 98%; corresponding to false positive values of 2.5%, 2%, and 1%, respectively. A decision tree model is offered for the optimal use of the three measures, so that portable breath testers can be sufficient for high level BrAC, stationary breath testers can be sufficient for medium level BrAC, and blood tests are recommended for still lower BrACs. The model provides quantitative BrAC threshold levels for the two most common BAC levels used to imply DWI: 50 mg/dl and 80 mg/dl.
KW - Alcohol
KW - Breath testing
KW - DWI enforcement
UR - http://www.scopus.com/inward/record.url?scp=79961171565&partnerID=8YFLogxK
U2 - 10.1016/j.aap.2011.06.013
DO - 10.1016/j.aap.2011.06.013
M3 - Article
AN - SCOPUS:79961171565
SN - 0001-4575
VL - 43
SP - 2188
EP - 2194
JO - Accident Analysis and Prevention
JF - Accident Analysis and Prevention
IS - 6
ER -