Toluene and the Intoxilyzer 5000 : no response to concentrations found on human breath.

The response of the Intoxilyzer 5000 (series 66, 3 filter) to known amounts of ethanol vapour, toluene vapour and a mixture of ethanol and toluene vapours was determined. The ethanol concentration approximates a Breath Alcohol Concentration (BrAC) of 0.08 gm/210 L. The toluene concentration used was approximately 5 times that reported to be found on the breath of test subjects 30 minutes post exposure. There was no response by the Intoxilyzer to the toluene alone and there was no added response to the ethanol/toluene mixture response over that of ethanol alone.