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Thursday, December 9, 2010

Skagit County DUI Attorneys: Breathalyzer myths

Breathalyzer myths
There are a number of substances or techniques that can supposedly "fool" a breathalyzer (i.e., generate a lower blood alcohol content).  A 2003 episode of the popular science television show MythBusters tested a number of methods that supposedly allow a person to fool a breathalyzer test. The methods tested included breath mints, onions, denture cream, mouthwash, pennies and batteries; all of these methods proved ineffective.  The show noted that using items such as breath mints, onions, denture cream and mouthwash to cover the smell of alcohol may fool a person, but, since they will not actually reduce a person's BAC, there will be no effect on a breathalyzer test regardless of the quantity used. Pennies supposedly produce a chemical reaction, while batteries supposedly create an electrical
charge, yet neither of these methods affected the breathalyzer results.
 The Mythbusters episode also pointed out another complication: It would be necessary to insert the item into one's mouth (e.g. eat an onion, rinse with mouthwash, conceal a battery), take the breath test, and then possibly remove the item - all of which would have to be accomplished discreetly enough to avoid alerting the police officers administering the test (who would obviously become very suspicious if they noticed that a person was inserting items into their mouth prior to taking a breath test). It would
likely be very difficult, especially for someone in an intoxicated state, to be able to accomplish such a feat.
 In addition, the show noted that breath tests are often verified with blood tests (which are more accurate) and that even if a person somehow managed to fool a breath test, a blood test would certainly confirm a person's guilt. However, it is not clear why a negative breath test would be verified by a subsequent blood test.
 Other substances that might reduce the BAC reading include a bag of activated charcoal concealed in the mouth (to absorb alcohol vapor), an oxidizing gas (such as N2O, Cl2, O3, etc.) that would fool a fuel cell type detector, or an organic interferent to fool an infrared absorption detector.  The infrared absorption detector is more vulnerable to interference than a laboratory instrument measuring a continuous absorption spectrum since it only makes measurements at particular discrete wavelengths. However, due to the fact that any interference can only cause higher absorption, not lower, the estimated blood alcohol content will be overestimated.  Additionally, Cl2 is rather toxic and corrosive.
 
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