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Citation |
Rosland M, Pon R. J. Can. Soc. Forensic Sci. 2011; 44(2): 41-46. |
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Copyright |
(Copyright © 2011, Canadian Society of Forensic Science, Publisher Informa - Taylor and Francis Group) |
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DOI |
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PMID |
unavailable |
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Abstract |
In 2009 the Alcohol Test Committee of the Canadian Society of Forensic Science changed the calibration check interval of Approved Screening Devices from every 2 weeks to every 31 days. Data from 612 calibration checks of a group of Alco-Sensor IV DWF screening devices were analyzed using a contingency table and x2 analysis as well as a significance test for a difference in proportions. There were no statistically significant differences between the length of time of the calibration interval and the frequency of a device requiring recalibration. This analysis shows the Alco-Sensor IV DWF is no more likely to require calibration up to and including a 5 week interval when compared to a 2 week interval, supporting the Alcohol Test Committee decision. |