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There is considerable debate about this subject. Some breath instruments have radio frequency interference detectors that automatically shut down the test sequence and print an error card if RFI interference is detected. Some experts take the position that cell phone interference can cause elevated BAC readings on breath test instruments. They suggest that if a cell phone is transmitting (a call is in progress) and it is placed near the instrument there will be strange results. Other experts insist that this is not the case. There is a need for study of this issue.
Police radios and other radio transmitters are also alleged to impact on the accuracy of breath tests.
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The Alcohol Test Committee of the Canadian Society of Forensic Science in its 2003 Recommended Standards and Procedures states Can. Soc. Forens. Sci. J. Vol. 36. No 3 (2003) pp. 101–127 at 115 "During performance of breath tests, no radio transmissions shall be made from the room in which the Approved Instrument is being operated."
See also: cell phone interference
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