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Citation |
Samija BP, Shajani NK, Wong BK. J. Can. Soc. Forensic Sci. 1985; 18(4): 211-221. |
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Copyright |
(Copyright © 1985, 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 |
The effect of Radio Frequency Interference (RFI) on evidentiary breath testing utilizing the Breathalyzer® models 900 and 900A as employed by the Royal Canadian Mounted Police (RCMP) was examined. Effects of various sources of potential EMI (Electromagnetic Interference) including AM/FM/TV transmitters, fluorescent light ballasts, telephone lines, teletype printers, base station transmitters, mobile police transceivers and portable handheld police receivers were evaluated. The model 900 was found to be unaffected by RFI while the model 900A was found to be susceptible to transmissions from transceivers positioned in close proximity to the instrument. Practical testing utilizing the operational protocol as outlined for the Breathalyzer technicians indicated that the probability of RFI resulting in inaccurate readings being presented to court was, for practical purposes, non-existent. If RFI were to occur, definite indications would be present making it detectable to a qualified Breathalyzer technician. |