A blood alcohol content of .3-.35 generally will render a non-drinker comatose. I've seen a heavy drinker pass out shortly after registering a .26.
Severe alcoholics can be apparently functional in the high .40s.
Taking a swig of alcohol just before doing a breath test can lead to elevated levels - I've had the opportunity to play around with a breathalyzer, and a single drink taken right before the blow can give a boost of about .15.
However, general police procedure for the test is to make sure the person does not drink or belch for at least 20 minutes before the test is taken; therefore, that's one HIGH blood alcohol level IF the test was administered correctly. However, seeing as it was a roadside device, it may have been a false reading. Further, roadside testers are notoriously inaccurate if they are not maintained and calibrated on a regular basis.
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