It has been pointed out to NHTSA that if this condensation occurs, it is possible for alcohol in one test to carry over to a second test, which would cause a false positive result. If the ambient air is cold enough, and if the hand held breath tester is unheated, it is possible for the moisture in the breath to condense onto the airway surface of the tester, and cause alcohol present to condense with it.
As it exits the mouth, the breath is saturated with moisture. Roadside testing at low temperature presents a potential problem not seen with testing done in the protected environments of law enforcement stations or mobile vans. Roadside breath testing by law enforcement using hand-held breath testers is becoming more important in detecting the drinking driver. Alco-Sensor IV at 10☌ - DOT HS 809 424 - March 2002 Department of Transportation - NHTSA - Special Testing for Possible Alcohol Carry Over Effects Using the Intoximeters, Inc.
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