The performance of the approved screening device, the  Alcotest® 7410 GLC in the field: Low incidence of false positive results in the identification of drinking drivers

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The performance of the approved screening device, the Alcotest® 7410 GLC in the field: Low incidence of false positive results in the identification of drinking drivers
Citation	Wilkie MP, Wigmore JG, Patrick JW. J. Can. Soc. Forensic Sci. 2003; 36(3): 165-171.
Copyright	(Copyright © 2003, Canadian Society of Forensic Science, Publisher Informa - Taylor and Francis Group)
DOI	10.1080/00085030.2003.10757559
PMID	unavailable
Abstract	A retrospective field study was conducted of 811 drinking drivers in the city of Toronto between January 1st 1998 and December 31st 1999 who had a breath alcohol concentration (BrAC) >0.099 g/210 L as determined by the Alcotest® 7410 GLC, the approved screening device (ASD). To determine the false positive rate of the ASD, its results were compared to the BrACs subsequently determined by the Intoxilyzer® 5000C, the evidential approved instrument. The BrACs determined by the Intoxilyzer® 5000C ranged between 0.000 and 0.310 g/210 L (mean 0.134 g/210 L). Seventeen drivers (2.1%) had a BrAC < 0.08 g/210 L and 117 drivers (14.4%) had a BrAC< 0.100 g/210 L at the time of the Intoxilyzer® 5000C test. When the BrACs are corrected for the time delay (0.1 to 2.6 hours) between the ASD and Intoxilyzer® 5000C tests, only two drivers (0.2%) had an estimated BrAC < 0.080 g/210 L and twelve drivers (1.5%) had a BrAC < 0.100 g/210 L. Thus, the Alcotest® 7410 GLC operated under field conditions has a low incidence of false positive tests.